Vol. 3, 2018

Table of contents

Radiobiology

ASSESSMENT OF THE ADAPTATION OF PATIENTS WITH ARS, VICTIMS OF CHNPP AND DIFFERENT RADIATION ACCIDENTS, PAST PSYCHOPHYSIOLOGICAL EXAMINATION

N. A. Metlyaeva, A. Yu. Bushmanov, V. I. Krasnuk, L. A. Yunanova, O. V. Shcherbatykh, A. S.Samoilov, D. Yu. Udalov

Pages: 1–5

DOI: 10.21175/RadProc.2018.01

The work was aimed to evaluate the adaptation of acute radiation sickness patients, victims of the Chernobyl Nuclear Power Plant (ChNPP) accident and different radiation accidents, who underwent follow-up psychophysiological examination. Clinical and psychophysiological follow-up examination covered 32 acute radiation sickness patients –11 with severe and extremely severe grade, who underwent Chernobyl nuclear power station accident, and 21 acute radiation sickness patients from other radiation accidents. The authors demonstrated the leading role of such psychological traits as hypochondriasis, anxiety about health, emotional tension, anxiety, inclination to depression, frustration tension, low self-confidence, suspiciousness, diffidence, affective rigidity, discontentment about the situation and personal position in it, restriction of contact with others - decrease of the stenicity and integration of behavior, that caused adaptation disorders in a distant period among acute radiation sickness patients victims of the Chernobyl nuclear power station accident and in acute radiation sickness patients from other radiation accidents. Intellectual faculties (according to the Cattell test) and imaginative and logic thinking (Raven’s test) in the patients who underwent radiation accidents were not affected, but were higher than the average in acute radiation sickness patients victims of the Chernobyl nuclear power station accident, especially in the first 15 years of observation, and equaled to the intellectual level of acute radiation sickness patients from other radiation accidents in the following 15 years of observation.
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  2. К. Н. Логановский, А. И. Нягу, “Характеристика психических расстройств у пострадавших вследствие Чернобыльской катастрофы в свете МКБ-10 Социальная и клиническая психиатрия,” т. 5, но. 2, стр. 15 – 23, 1995. (K. N. Loganovsky, A. I. Nyagu, “Characteristics of mental disorders in victims of the Chernobyl disaster in the light of ICD-10,” Social and Clinical Psychiatry, vol. 5, no. 2, pp. 15 – 23, 1995.)
  3. А. К. Наприенко, К. П. Логановский, “Пограничные нервно-психические расстройства у лиц, подвергшихся воздействию ионизирующего излучения,” Врачебное дело, но. 6, стр. 48 – 52, 1992. (A. K. Naprenenko, K. N. Loganovskiy. “Borderline neuropsychiatric disorders in persons exposed to ionizing radiation,” Medical work, no. 6. pp. 48 – 52, 1992.)
  4. А. К. Напреенко, К. Н. Логановский, “Систематика психических расстройств, связанных с последствиями аварии на ЧАЭС,” Врачебное дело, но. 5-6, стр. 25 – 28, 1995. (A. K. Naprenenko, K. N. Loganovskiy, “Systematics of Mental Disorders Associated with the Consequences of the Chernobyl Nuclear power plant accident,” Medical work, no. 5-6, pp. 25 – 29, 1995.)

BIODOSIMETRY AND PHYSICAL DOSIMETRY TOOLS IN RADIATION EXPOSURE ASSESSMENT

Aleksandar P.S. Milovanović, Jelena Pajić, Dubravka Jovičić

Pages: 6–9

DOI: 10.21175/RadProc.2018.02

Occupational exposure to ionizing radiation (IR) involves operations with unsealed or sealed sources. Nuclear medicine staff using unsealed sources is of particular interest for dosimetry research because they are exposed to extremely inhomogeneous fields of ionizing radiation with an increased risk of internal contamination. The findings for two technicians who were unintentionally exposed to IR while operating unsealed sources in the Nuclear Medicine Department are presented here. Exposure evaluation was conducted at the Radiation Protection Center of the Serbian Institute of Occupational Health (SIOH). Values for the personal dose equivalent at a body depth of 10 mm at the point of application of the personal dosimeter [Hp(10)], the dose equivalent at a body depth 0.07 mm at the application point of the personal dosimeter [Hp(0.07)], and the results for chromosomal aberrations (CA) and micronuclei (MN) analysis after the first and control examinations at the Cytogenetic Laboratory (SIOH) are presented. The case report for Technician 1 (T1) is an example of agreement between the findings obtained by physical dosimetry and cytogenetic analysis in detecting unintentional exposure and internal contamination with high doses of radionuclides. The results also show that the cytokinesis block micronucleus (CBMN) test is a more sensitive technique in detecting internal contamination than CA analysis. Multiple MN are an unequivocal indicator of genetic damage. Since radiation is a strong inducer of MN, these genetic changes may be a certain biomarker of internal contamination.
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DNA REPAIR PROCESSES IN HUMAN LYMPHOCYTES IRRADIATED WITH A 60-MeV PROTON RADIOTHERAPEUTIC BEAM

Agnieszka Panek, Justyna Miszczyk

Pages: 10–14

DOI: 10.21175/RadProc.2018.03

One of the main factors that differentiate people in terms of the effectiveness of therapeutic procedures or side effects is the variability in DNA repair capabilities. The aim of the study was to investigate the response of DNA damage repair systems in human lymphocytes irradiated with the therapeutic proton beam in the Bronowice Cyclotron Center of Institute of Nuclear Physics, Polish Academy of Sciences (IFJ PAN) in compare to X-rays. Lymphocytes from healthy donors were irradiated in the Spread-Out Bragg Peak of the proton beam or as reference X-rays. For both sources of radiation, the kinetics of the DNA damage repair capabilities were estimated using the comet assay method (0–120 min) and γ-H2AX test (0-24h). Preliminary results from the comet assay show a similar time and repair efficiency of induced DNA damage for both types of radiation. However, in a group involving X-rays, significant inter-individual differences were observed. With the γ-H2AX test, inter-individual differences in the repair capabilities were not noted. These findings indicate that induced DNA damage repair mechanisms after proton irradiation may be different when compared to X-rays.
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Radiation Chemistry

SORPTION REMOVAL OF Sr2+ AND Y3+ IONS FROM AQUEOUS SOLUTIONS BY A TiO2 -BASED SORBENT

I. F. Myroniuk, H. V. Vasylyeva

Pages: 15–20

DOI: 10.21175/RadProc.2018.04

In present investigations, the sorption removal of Sr2+ and Y3+ ions from aqueous solutions by TiO2 – La sorbent was researched. The dependence of the sorption process on the time of interaction, solution’s acidity, and initial concentrations of the Sr2+ and Y3+ ions were investigated. Four simplified kinetic models – Lagergren’s pseudo-first and pseudo-second order kinetic models, Intra-particle diffusion and Elovich models – were tested to describe the adsorption process. Equilibrium isotherms data were analyzed using Langmuir and Freundlich isotherm models. The kinetic data indicated that the adsorption of Sr2+ and Y3+ ions by ТіО2–La fitted well with the pseudo-second order kinetic model with coefficients of linear approximation (R2 = 0.99) for both elements. The application of the Elovich model to the experimental data of the sorption of Sr2+ and Y3+ ions by ТіО2–La shows that yttrium is absorbed due to the mechanism of chemisorption. Coefficient of linear approximation R2 = 0.98. Strontium is absorbed via physical sorption or ion exchange mechanism. The maximum adsorption capacity of ТіО2 –La was found to be 0,9 mmol·g-1 (79 mg g-1) for Sr2+ and 1.6 mmol·g-1 (134 mg·g-1) for Y3+.
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Radiation Measurements

DETERMINATION OF 226Ra AND 228Ra IN WATER USING LabSOCS EFFICIENCY CALIBRATION SOFTWARE FOR GAMMA SPECTROMETRIC ANALYSIS

Manjola Shyti, Miha Trdin

Pages: 21–24

DOI: 10.21175/RadProc.2018.05

Radium (Ra) isotopes are important from the viewpoints of radiation protection and environmental protection. Radium is routinely analyzed in drinking water. Radium isotopes can be analyzed by different analytical methods based on gamma spectrometric measurements or alpha spectrometry. Modern gamma spectrometry systems are typically operated via computer software applications. In this study, the LabSOCS (Laboratory Sourceless Calibration Software) mathematical efficiency calibration software is used. An improved method was developed to determine radium isotopes from water using gamma spectrometry after micro-coprecipitation as lead (radium) sulfate method for radiochemical separation (Pb(Ra)(Ba)SO4). This method was successfully modified to allow direct determination of 226Ra and 228Ra by gamma spectrometry. However, large volumes of samples and/or long waiting time (20 days), before radioactive equilibrium is established, are required for accurate 226Ra activity concentration determination. The amounts of 226Ra and 228Ra on the sample were quantified by using gamma spectrometric analysis for its 186 keV gamma emission, 351.9 (214Pb), 295.2 (214Pb), and 609.3 (214Bi), 1764.5 (214Bi) and for 228Ra can be nonetheless achieved via its daughter nuclide 228Ac in 911.2 and 969 keV gamma emission. The radiochemical recovery was 93% and 100% for 226Ra and 228Ra, respectively. The Minimum Detectable Activities (MDAs) for 8L of sample and a measuring time of 2.3 days for 226Ra and 228Ra were calculated. The best results were obtained when the herein described method was combined with LabSOCS calculations.
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THE USE OF THE FUNDAMENTAL PARAMETERS METHOD TO CALCULATE THE CONCENTRATIONS OF ELEMENTS IN ENVIRONMENTAL SAMPLES USING XRF PORTABLE SYSTEMS

Alketa Sinanaj, Blerina Papajani

Pages: 25–31

DOI: 10.21175/RadProc.2018.06

The X-ray fluorescence method is known as a laboratory method and one of the few atomic spectroscopy methods used in many fields. The process of emission of the characteristic X-rays is called “X-ray fluorescence” (XRF). The objectives of this research study are optimization of the XRF portable system geometry and the use of the fundamental parameters method to calculate the concentrations of elements in environmental samples using portable systems. Since this method is quick in getting results and does not destroy the sample, it is widely used both in research and in the analysis of industrial products for materials in the field of mineralogy, geology, environmental analysis of water, air, etc. Various experiments have led to the optimization of the geometry system, as the distances’ minimization, angles optimization, and the assessment of the beam spot in the position of the sample. Most of the data collected are used as initial data in the ADMCA program that uses fundamental parameters (FP-XRF) for calculating the concentrations of elements in environmental samples. Errors in calculating the concentrations of the sediment and soil samples when we introduce the approximate content of light elements can be eligible for geochemical studies. During the research, several areas that can be used in the future to improve the results are identified.
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DETERMINATION OF COINCIDENCE SUMMING CORRECTION FACTORS FOR 22Na POINT SOURCE

Aleksandar Jevremović, Aleksandar Kandić, Mirjana Djurašević, Ivana Vukanac, Igor Čeliković, Zoran Milošević, Jovan Puzović

Pages: 32–35

DOI: 10.21175/RadProc.2018.07

The coincidence summing effect plays an important role in HPGe spectrometry, especially at low source-detector distances, due to a large solid angle; therefore, the calculation of correction factors is necessary. The aim of the research described in this paper was to compare values of correction factors for a 22Na point source obtained using the GESPECOR software package (Monte-Carlo method) and experimentally obtained values. Measurements were performed using a semiconductor HPGe spectrometer and the point source axially positioned at nine different distances from the detector end-cap. For the purpose of determining correction factors, a system of equations was formed, which, besides nuclear data as the input parameters, uses the experimentally obtained values of the total count in the entire spectrum, as well as the counts in the full energy peaks. The system of equations was solved for each particular case and correction factors were determined. By comparing the results obtained using the experimental and Monte-Carlo method, it was found that the correction factors for the 22Na point source have discrepancies less than 3%. The significance of these discrepancies was also verified from a statistical point of view using a Student's t-test.
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THE UNCERTAINTIES OF PERSONAL NEUTRON DOSIMETERS AT VARIOUS OPERATIONAL NEUTRON FIELDS

Mariia Pyshkina, Michael Zhukovsky, Alexey Ekidin

Pages: 36–41

DOI: 10.21175/RadProc.2018.08

Albedo thermoluminescent and direct-reading electron personal neutron dosimeters were examined. The ratio introduced by the difference between calibration and operational spectra were studied. The ratio of dosimeter reading and personal dose equivalent to a variety of workplace spectra after calibration is in the range from 0.6 up to 106. A new dosimeter for neutron exposure was presented. It is suggested that the dosimeter should be used inside of the body. The difference between its response function and fluence-to-effective dose conversion function is in the factor of 7 and 9 for anteroposterior (AP) and rotation (ROT) exposure geometries respectively. This dosimeter might be used at emergency situations, when neutron spectrum is similar to one of nuclear fuel radionuclides fission reaction.
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MEASUREMENT OF AMBIENT DOSE EQUIVALENT H*(10) IN THE SURROUNDING OF NUCLEAR FACILITIES IN SERBIA

Aleksandra Sokić, Luka Perazić, Ivan Knežević

Pages: 42–46

DOI: 10.21175/RadProc.2018.09

In the Public Company Nuclear Facilities of Serbia, the measurement of the operational dosimetric quantity, ambient dose equivalent H*(10), is continuously carried out at measurement points in the surrounding of the radioactive waste storage facilities (hangars H1, H2 and H3) and old reactor buildings (RA and RB), located at Vinca site in Belgrade. For that purpose, two different types of passive dosimeters are used: thermoluminescent (TL) high sensitivity dosimeters (LiF:Mg,Cu,P) and optically stimulated luminescence (OSL) dosimeters (Al2O3). The principle of radiation interaction with both types of material is very similar, and the main difference is reflected in the method of detecting the light which is in relation to the dose in the dosimeter. The measurement of the ambient dose equivalent is performed at 34 measuring points in order to monitor the level of radiation exposure in the vicinity of the mentioned facilities. The paper shows the results of the measurements in the period from January to December of 2016. TL and OSL dosimeters were used and read once a month at the same time under the same measurement conditions. The aim of this paper is to present the comparative results of the ambient dose equivalent measurements using TL and OSL dosimeters and compare them with the measurement results of the reference instrument for measuring dose rate (Atomtex AT6101C spectrometer) at the same measuring points. It was found that the differences among the measurement results using different dosimeter types were satisfactory, with a maximum deviation of 35%. The results also show that there is no significant increase in the level of radiation exposure, which is of particular importance to the environment and the population around nuclear facilities in Serbia.
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  6. AOMTEX official webpage, ATOMTEX, Minsk, Belarus, 2018.
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  8. R. Casanovas, E. Prieto, M. Salvado, “Calculation of the ambient dose equivalent H*(10) from gamma-ray spectra obtained with scintillation detectors,” Appl. Radiat. Isot., vol. 118, pp. 154 – 159, Dec. 2016.
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Radiation Protection

RADIATION AND VIDEO SURVEY OF WATER CLEANUP AND VENTILATION SYSTEM OF RFT REACTOR

A.G. Volkovich, Iu.N. Simirskii, A.V. Stepanov, S.V. Smirnov, A.M. Safronov, I.A. Semin, V.E. Stepanov

Pages: 47–51

DOI: 10.21175/RadProc.2018.10

The specialists of NRC “Kurchatov Institute” have conducted the dismantling of the MR multiloop research reactor and RFT reactor. The technical start-up of the 20 MW capacity experimental graphite water cooling reactor (RFT) started in 1952. The reactor was shut down 10 years after the working period. The fuel was removed and the reactor was partially dismantled. The ventilation system and water cleanup system of the RFT reactor were located in a separate building. The upper part of the reactor vent stack was dismantled in the early 60’s. The water cleanup system, which consists of 6 stainless steel tanks (4 – Ø1.5m, h=5m; 2 – Ø3m, h=5m) located around the base reactor vent stack, was mothballed. To plan the dismantling work, a radiation and video survey of the water cleanup system and the reactor vent stack was carried out. For this purpose, holes were drilled in the upper ceiling of premises with the water cleanup system and at the top of vent stack. Through these holes video recording and measurement of the exposure dose rate distribution were carried out. The measurement of the exposure dose rate distribution along the height of vent stack was also carried out. Based on the result of these surveys, the measurements of distribution of activity from radioactive waste along the height of the tank were carried out. The collimated spectrometric system on the basis of a semiconductor detector CdZnTe (volume of a crystal of 60mm3) was used. The measurements showed that the distribution of activity from radioactive waste along the height of the tank was non uniform. To measure the distribution of the contamination of the inner surface vent stack we used the spectrometric system with semiconductor detector CdZnTe (volume of a crystal of 500mm3) with circular collimator. The results of measurements are presented and discussed. The results of the survey will be used for planning the dismantling work.
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  3. A. G. Volkovich, O. P. Ivanov, A. V. Lemus et al, “Particularities of the Dismantling of the Intra-Vessel Structures of the RFT Reactor,” Atomic Energy., vol. 121, no. 5, pp. 377 – 382, Mar. 2017.
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  4. I. Simirskii et al., “Particularities of the Dismantling of the Intra-Vessel Structures of the RFT Reactor,” in Proc. 43rd Annual Waste Management Conference (WM2017), Phoenix (AZ), USA, 2017.
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  6. V. E. Stepanov, A. G. Volkovich, V. N. Potapov et al., “The CdZnTe Detector with Slit Collimator for Measure Distribution of the Specific Activity Radionuclide in the Ground,” in Proc. Int. Conf. Advanced Measurement Methods and their Applications (ANIMMA17), Liege, Belgium, 2017.
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  7. V. E. Stepanov, V. N. Potapov, O. P. Ivanov, “The development of non destructive remote measurement method of concrete contamination,” in Proc. 15th Int. Conf. Environmental Remediation and Radioactive Waste Management (ASME 2013), Brussels, Belgium, 2013, p. V002T03A009.
    DOI: 10.1115/ICEM2013-96047

DETERMINING THE ZONE OF INFLUENCE OF TRANSMISSION OVERHEAD POWER LINES FROM THE ASPECT OF NON-IONIZING RADIATION

Maja Grbić, Aleksandar Pavlović

Pages: 52–57

DOI: 10.21175/RadProc.2018.11

The paper presents the methodology for determining the area in the vicinity of overhead power lines where the levels of non-ionizing radiation are significant in the context of current regulations referring to the protection of the general public in the Republic of Serbia. A brief review of Serbian legislation on protection of the general public from power frequency electromagnetic fields is given. The zones of influence of 110 kV, 220 kV and 400 kV transmission overhead power lines are determined by calculations. The configurations of power lines which result in the widest zone of influence are analyzed for each voltage level. The influence of phase conductor heights on the width of the zone is also considered. Determining the width of the zone of influence is very important for planning the construction of new power lines near residential areas, as well as for the construction of residential buildings near existing lines. It is also significant when it is necessary to determine the locations in the vicinity of overhead power lines where more detailed testing of non-ionizing radiation should be performed by measurements.
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  6. Мере за ограничење електричног и магнетског поља,студија бр. 3414017,Електротехнички институт „Никола Тесла”, Београд, Србија,2014.(Techniques for limiting the levels of electric and magnetic field, study no. 3414017, Nikola Tesla Electrical Engineering Institute, Belgrade, Serbia, 2014.)
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QUANTIFICATION OF THE OPERATOR PROXIMITY EFFECT ON THE MEASUREMENT RESULTS OF ELECTRIC FIELD STRENGTH IN THE VICINITY OF OVERHEAD POWER LINES

Maja Grbić, Aleksandar Pavlović

Pages: 58–62

DOI: 10.21175/RadProc.2018.12

In this paper, the operator proximity effect on the measurement results of the electric field strength in the vicinity of overhead power lines is analyzed. The operator proximity effect depends on the distance between the operator and the probe for measuring the electric field strength, as well as on the height at which the probe is placed. The paper presents the results of the electric field strength measurements performed in the vicinity of a 220 kV overhead power line in order to quantify the influence of the proximity of the operator. The measurements were carried out by using a cube-shaped isotropic probe. During the measurements, the probe was placed on a wooden tripod and connected to the electromagnetic field analyzer by an optical cable. The measurements were performed at the heights of 1 m, 1.5 m and 1.7 m. The distance between the operator and the measuring probe during these measurements was gradually increased from 1 m to 10 m. The obtained results are analyzed in detail in this paper. These results can be used for evaluating the electric field strength measurement uncertainty. The significance of these results also lies in demonstrating the manner in which the operator’s influence on the measured field can be reduced to an acceptable level.
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CBRN DEFENCE: ORGANIZATION, RESOURCES AND TASKS OF SERBIAN ARMED FORCES

Stevan Musicki, Dejan Vasovic, Srdjan Markovic

Pages: 63–67

DOI: 10.21175/RadProc.2018.13

The concept of CBRN (chemical, biological, radiological, nuclear) defence is a highly complex phenomenon and a scientific discipline within both the social and technical-technological sciences. CBRN defence has multiple meanings. In the most general sense, it refers to absence/elimination or minimization of threats, i.e. pressures that can threaten people, property, and the environment. Effective and efficient CBRN defence activities can be seen from the perspective of civil structures or armed forces. In this sense, the organizational structure of the armed forces of any country represents a dynamic system which, within the wider community, operates and exists under specific conditions and circumstances. Starting from its basic purposes, the regular armed forces of any state do not have unknowns regarding the rules and their core roles. However, the complex structure and the interdependence of different organizational structures within the country and within the armed forces have an impact on the implementation of measures in the field of CBRN defence and management of risk both in war and peacetime. The aim of this paper is to present the structural organization, resources and tasks of the Serbian armed forces (SAF) within the field of CBRN defence.
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  5. Народна скупштина Републике Србије. (28.09.2012). Закон о заштити од јонизујућег зрачења и нуклеарној сигурности. (National Assembly of the Republic of Serbia. (Sep. 28. 2012). Law on the ionizing radiation protection and nuclear safety.)
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  7. S. Mušicki, V. Nikolić, D. Vasović, “Resource protection - the Serbian Army experience,” in Proc. VI International Symposium Engineering Management and Competitiveness (EMC 2016), Kotor, Montenegro, 2016, pp. 110 – 113.
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  8. S. Mušicki, V. Nikolić, D. Vasović, “Safety, security, hazard and risk – a conceptual approach,” in Proc. 7th DQM International Conference Life Cycle Engineering and Management (ICDQM-2016), Prijevor, Serbia, 2016, pp. 396 – 401.
  9. D. Vasović, J. Malenović Nikolić, G. Janacković, “A quick glance at disaster risk reduction from different perspectives,” in Proc. Int. Conf. Life Cycle Engineering and Management (ICDQM-2016), Prijevor, Serbia, 2016, pp. 193 – 200.
  10. S. Mušicki, “Integrative model or resource protection improvement in MoD and SAF,” Ph.D. dissertation, University of Defence, Military Academy, Belgrade, Serbia, 2016.
  11. 246. батаљон АБХО, Војска Србије, Београд, Србија, 2018.(246th CBRN battalion of the Serbian Army, Serbian Armed forces, Belgrade, Serbia, 2018.)
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  12. D. Indjić, “Possibility of the development of Serbian protection system of chemical accident,” Mil. Tech. Cour., vol. 60, no. 4, pp. 133 – 146, 2012.
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  14. Народна скупштина Републике Србије. (10.05.2018). Закон о Војсци Србије. (National Assembly of the Republic of Serbia. (May 10, 2018). Law on Serbian Armed Forces).
    Retrieved from: https://www.paragraf.rs/propisi/zakon_o_vojsci_srbije.html;
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CBRN DECONTAMINATION CONSIDERED BY THE CONCEPT OF CBRN SECURITY: A SERBIAN CASE

Dejan Vasovic, Stevan Musicki, Sladjan Hristov

Pages: 68–72

DOI: 10.21175/RadProc.2018.14

Nuclear and chemical accidents lead to endangering the health of citizens and the environment due to contamination by radiological and chemical contaminants and consequently cause security risks for the population and material goods. Decontamination related to CBRN (chemical, biological, radiological, nuclear) events represents a set of processes and activities aimed at total or partial removal or neutralization of radiological, chemical, and biological contamination caused by an intended or non-intended threat, thereby reducing the risk of exposure to the people or the environment up to the permissible levels. The primary and ultimate goal of decontamination is the complete elimination of radioactive contaminants or the minimization of contamination levels of chemical and biological contaminants. The aim of this paper is to demonstrate the relevance of CBRN decontamination observed from multiple perspectives: the environmental resources protection standpoint, the society wellbeing standpoint, and the operative personnel and experience-knowledge standpoint to engage them in the most effective manner.
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  6. Д. Васовић, “Хибридни модел управљања капацитетом животне средине,” докторска дисертација, Универзитет у Нишу, Факултет заштите на раду, Ниш, Србија, 2016. (D. Vasovic, “Hybrid model of environmental capacity management,” Ph.D. dissertation, University of Niš, Faculty of Occupational Safety, Niš, Serbia, 2016.)
    Retrieved from: http://www.znrfak.ni.ac.rs/SERBIAN/013-OGLASENI-DOKUMENTI/DOKTORSKE%20DISERTACIJE/Dejan%20Vasovic/Dis_UNI_ Dejan_M_Vasovic_2016%20sa%20napomenom.pdf;
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  7. Народна скупштина Републике Србије. (18.11.2011). Национална стратегија заштите и спасавања у ванредним ситуацијама. (National Assembly of the Republic of Serbia. (Nov. 18, 2011). National strategy for protection and rescue procedures in emergency situations.)
    Retrieved from: http://arhiva.mup.gov.rs/cms_lat/sadrzaj.nsf/Nacionalna_strategija_zastite_i_spasavanja_u_vanrednim_situacijama_la t.pdf;
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  9. Народна скупштина Републике Србије. (6.10.2012). Закон о ванредним ситуацијама. (National Assembly of the Republic of Serbia. (Oct. 6, 2012). Law on emergency situations.)
    Retrieved from: http://prezentacije.mup.gov.rs/svs/html/Zakon%20o%20VS.pdf;
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  10. Народна скупштина Републике Србије. (28.09.2012). Закон о заштити од јонизујућег зрачења и нуклеарној сигурности. (National Assembly of the Republic of Serbia. (Sep. 28. 2012). Law on the ionizing radiation protection and nuclear safety.)
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  11. Народна скупштина Републике Србије. (10.05.2018). Закон о одбрани. (National Assembly of the Republic of Serbia. (May 10. 2018). Law on defense.)
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    Retrieved on: Sep. 15, 2018
  12. Народна скупштина Републике Србије. (10.05.2018). Закон о Војсци Србије. (National Assembly of the Republic of Serbia. (May 10. 2018). Law on Serbian Armed Forces.)
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  13. BM Országos Katasztrófavédelmi Foigazgatói. (24.1.2017). Intézkedés a Katasztrófavédelmi Muveleti Szolgálat, a Katasztrófavédelmi Mobil Labor, valamint a Katasztrófavédelmi Sugárfelderíto Egység tevékenységének szabályozásáról. (National Directorate General for Disaster Management, Ministry of the Interior. (Jan. 24, 2017). Rule No. 4/2017 on issuing the Operational Regulations and Methodological Guide of the Disaster Management ‘s CBRN Units.)

THE EVALUATION OF THE DOZE RATE FIELD OF INDUSTRIAL X-RAY EQUIPMENT FOR NDT

Esmeralda Vataj, Uarda Gjoka, Fatos Ylli, Blerina Papajani

Pages: 73–76

DOI: 10.21175/RadProc.2018.15

Nondestructive Testing (NDT) is a non-invasive method based on physical principles used to evaluate the integrity and characteristics of materials. Its measurement methodology covers a wide range of applications of materials and structures that relate to the entire life cycle, from manufacture to use and retirement. Radiography is one of the most important and widely used NDT methods for volumetric examination. In general, Radiography Testing (RT) is a method of inspecting materials for hidden flaws by using the ability of short wavelength electromagnetic radiation (high energy photons) to penetrate various materials. The intensity of radiation that penetrates and passes through the material is captured by a radiation sensitive film. This study presents the evaluation of the dose rate field in and around the radiation beam for MHF 200D X-ray tube model, using a large interval of voltage (20 to 200 kV) and current (0.5 to 8 mA). We controlled the variables that represent the essential characteristics of beam radiation quality, such as voltage (kV), and determined the Half-Value Layer (HVL) for different values of voltage and current.
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Radioecology

ANALYSIS OF ACTIVITY CONCENTRATION OF NATURAL RADIONUCLIDES IN THE SOIL OF THE INSTITUTE OF APPLIED NUCLEAR PHYSICS IN ALBANIA AND THE ASSESSMENT OF ANNUAL EFFECTIVE DOSE

Manjola Shyti, Irma Bërdufi, Florinda Cfarku, Gerti Xhixha

Pages: 77–80

DOI: 10.21175/RadProc.2018.16

Terrestrial gamma radiation levels are significantly affected by the radionuclides that are present in the soil, which in turn can be used for the assessment of the terrestrial gamma dose rate. This study is important because the employees of this institute, in addition to professional exposure, will be familiar with the average annual effective dose equivalents (AEDEs) in soils that come from this area. The main radioactive materials are the long-lived radionuclides, such as 238U, 232Th and 40K, known as NORMs (Naturally Occurring Radionuclide Materials). Natural radioactivity analysis has been done for the soil samples collected from the area of the Institute of Applied Nuclear Physics (IANP) in Tirana, Albania. The activity concentration of Radium (226Ra), Thorium (232Th) and Potassium (40K) were measured in these samples using HPGe (High Purity Germanium) detector based on low background gamma-ray counting system. From the measured activity concentration of the above three natural radionuclides, the external gamma absorbed dose rate and the annual effective dose were calculated. The obtained mean values of gamma absorbed dose rate and annual effective dose in soil samples were found to be comparable with the worldwide average as reported by United Nations Scientific Committee on the Effects of Atomic Radiation. The natural radioactivity levels in soils of IANP area had never been studied before. This study aims to determine the dose rate in order to assess the health risks from the activity concentration of the natural radionuclides as 238U, 232Th and 40K in the soil. Also, the Radium equivalent (Raeq) of the samples is calculated and compared with the similar data reported in literature. The values of the outdoor annual effective dose were in the range of 0.02 to 0.11 mSv, showing that the area of IANP was radiologically safe.
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    DOI: 10.1021/ac60259a007
  6. Ş. Turhan, A. Köse, A. Varinlioğlu, İ. H. Arıkan, F. Oğuz, B. Yücel, T. Özdemir, “Distribution of terrestrial and anthropogenic radionuclides in Turkish surface soil samples,” Geoderma, vol. 187-188, pp. 117 – 124, Oct. 2012.
    DOI: 10.1016/j.geoderma.2012.04.017

CORRELATION OF RADIATION AND METEOROLOGICAL PARAMETERS DURING ENVIRONMENTAL RADIATION MONITORING IN PUBLIC COMPANY “NUCLEAR FACILITIES OF SERBIA”

Vesna Radumilo, Ivan Knežević, Dalibor Arbutina

Pages: 81–84

DOI: 10.21175/RadProc.2018.17

Public Company “Nuclear Facilities of Serbia” is the only nuclear operator in Serbia. Under the radiation safety and radiation protection measures of people and environment, Public Company conducts the environmental radiation monitoring around nuclear facilities. Monitoring also includes relevant meteorological measurements at the micro-location. This paper shows the correlation between the change of ambient gamma dose rate equivalent in the air and meteorological parameters: precipitation and the relative humidity in air. All the measurements were taken at the site of a meteorological tower on 114 meters above sea level, in the vicinity of nuclear facilities. Monthly values of relative humidity of the air and intense rainfall were obtained during 2017. The analysis of this relation clearly shows the impact of the intense rain and the relative humidity of the air on the ambient gamma dose rate equivalent. Calculated Pearson's correlation coefficient shows the degree of the above-mentioned dependence.
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  7. J. F. Mercier et al., “Increased environmental gamma-ray dose rate during precipitation: a strong correlation with contributing air mass,” J. Environ. Radioact., vol. 100, no. 7, pp. 527 – 533, Jul. 2009.
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  9. V. Radumilo, I. Knežević, D. Žarković, D. Arbutina, “Korelacija radijacionih parametara i količine padavina prilikom monitoringa radioaktivnosti u okolini nuklearnih objekata,” у Zbornik radova XXIX Simpozijuma (DZZSCG, 2017), Srebrno jezero, Srbija, pp. 2017, 37-44. (V. Radumilo, I. Knežević, D. Žarković, D. Arbutina, “Correlation of radiation parameters and the level of precipitations during monitoring of radioactivity in the vicinity of nuclear facilities” in Proc 29th Symposium, Society for Radiation Protection of Serbia and Montenegro (DZZSCG, 2017), Srebrno jezero, Serbia, 2017, pp. 37 – 44.
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DETERMINATION OF THE ACTIVITY CONCENTRATION OF 137Cs AND 40K IN BLUEBERRY-BASED PRODUCTS CONSUMED IN SERBIA

Borjana Vranješ, Velibor Andrić, Mila Vranješ, Jelena Ajtić, Branislava Mitrović

Pages: 85–88

DOI: 10.21175/RadProc.2018.18

The aim of the study is the investigation of the activity concentration of 137Cs and 40K in blueberry-based products that are available on the market in the Republic of Serbia. Samples were bought in stores during September 2017 and in total, ten packaged juices, two jams, two sweets and a fresh wild blueberry were measured. The activity concentrations of 137Cs in blueberry-based juices, jams and sweets varied from <MDA to 4.1 Bq/kg, <MDA to 21 Bq/kg and 0.6 Bq/kg to 28 Bq/kg, respectively. The average activity concentration of 137Cs in fresh wild blueberry was 4.1 Bq/kg. In Serbia, the recommended activity concentration of 137Cs in juices and sweets is 15 Bq/kg and 150 Bq/kg in fresh blueberries. The tested samples of juices, jams, fresh wild blueberry and one of the sweets meet the set criteria for 137Cs while one sweets sample exceeds the limit. The activity concentrations of 40K in juices, jams and sweets varied from 3.5 to 55 Bq/kg, 13.9 to 19.2 Bq/kg and 17.2 to 227 Bq/kg, respectively. The average activity concentration of 40K in fresh wild blueberry was 32 Bq/kg. With the obtained result the annual effective dose equivalent due to ingestion of blueberry-based products for adults was calculated, and for 137Cs in blueberry-based juices, jams, sweets and fresh wild blueberry varied from 0.2 to 2.5 mSv, 2.8 mSv, 0.4 to 17.0 mSv and 2.5 mSv, respectively. The annual effective dose equivalent for 40K in blueberry-based juices, jams, sweets and fresh wild blueberry varied from 1.0 to 16.0 mSv, 1.2 mSv, 5.0 to 66.0 mSv, and 9.3 mSv, respectively.
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RISK ANALYSIS AND ANNUAL EFFECTIVE DOSE DUE TO TERRESTRIAL AND COSMIC RADIATION IN THE REGION OF NIĞDE PROVINCE (TURKEY)

Mehmet Erdogan, Kaan Manisa, Hasan Bircan, İbrahim Çevik, Nesli Bingöldağ, Recep Biyik, Veysel Zedef

Pages: 89–93

DOI: 10.21175/RadProc.2018.19

The radiation exposure for people and all living things is inevitable. Most of these exposures are due to natural sources. Terrestrial and cosmic radiation sources are the most important contribution to these exposures which originated from the fractionation of U-238, Th-232, gamma radiation of K-40 and high-energy cosmic particles incident on the earth’s atmosphere. The main contribution to these exposures comes from terrestrial sources. Terrestrial radionuclides are found in various concentrations in the crust of the earth depending on geological conditions of the region. They also cause exposure risks externally due to their gamma-ray emissions. This study assesses the terrestrial and cosmic radiation dose rates from the naturally occurring radionuclides in the region of Niğde province of Turkey. The measurements were performed on the surface soil using NaI(Tl) scintillation type gamma-ray detector. The external annual effective doses and cancer risk for people living in the region are also calculated from such terrestrial and cosmic gamma radiation dose rates for each individual.
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URANIUM IN FOODSTUFF SAMPLES FROM TWO REGIONS IN BULGARIA WITH RELATIVELY HIGH LOCAL LEVELS OF RADIOACTIVE BACKGROUND

Radoslava Lazarova, Ivanka Yordanova, Donka Staneva

Pages: 94–97

DOI: 10.21175/RadProc.2018.20

Bulgaria is a country which developed uranium (U) mining in the past. In the present study U content in different foodstuffs was determined in answer to public concern of possible radiological risk raised by relatively high U concentration measured in drinking waters in the regions of Haskovo and Plovdiv. Around them uranium mining was carried out on a large scale in the past (around Haskovo under the classical mining method and around Plovdiv under the method of geotechnological drilling). Vegetable (alfalfa, carrots, potatoes and tomato paste) and animal (milk and minced meat) samples were studied and radioactivity concentration (Bq.kg-1) of two natural U isotopes was determined in the following intervals: U-234 –0.004 – 1.00 and U-238 –0.004 – 0.76. Calculated natural U concentration (mg/kg) was 0.0010 – 0.0712. Results were comparable with data cited in literature for U content in foodstuffs from former U mining regions in Europe and considered not radiologically hazardous to the population.

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ACTIVITY CONCENTRATION OF URANIUM, THORIUM AND POTASSIUM IN THE URINE OF ROE DEER (C. CAPREOLUS) IN VOJVODINA (NORTHERN PROVINCE OF SERBIA)

Željko Mihaljev, Milica Živkov-Baloš, Sandra Jakšić, Brankica Kartalović, Nenad Popov

Pages: 98–102

DOI: 10.21175/RadProc.2018.21

The naturally occurring radionuclides are the major source of radiation to which humans are exposed to. A total of 21 samples of roe deer (Capreolus capreolus) from different locations in Vojvodina were tested. The samples were prepared for measuring by microwave digestion. The content of potassium in the samples was determined using atomic absorption spectrometry (AAS) The total content of uranium and thorium were determined using inductively coupled plasma mass spectrometry (ICP-MS). The concentration of the activity of the tested radionuclides was calculated based on their specific activities. It can also be concluded that potassium-40 is the predominant natural radionuclide in urine as compared to other radionuclides and it moved in the range of 128-381 Bq/L. The results of urine analysis showed wide ranges in radionuclide activity concentrations: 18.4-231.9 mBq/L for 238U, 0.94-11.90 mBq/L for 235U and 1.03-89.02 mBq/L for 232Th.
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  15. Ž. Mihaljev, B. Kartalović, N. Popov, S. Jakšić, M. Živkov-Baloš, “Thorium-232, Uranium-235 and Uranium-238 content in internal organs of wild birds from the area of Vojvodina,” in Book of Abstr. 8th Symposium Chemistry and Environmental Protection with international participation (ENVIROCHEM 2018),Kruševac, Serbia, 2018, pp. 191 – 192.
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  16. P. Schramel, I. Wendler, P. Roth., E. Werner, “Method for determination of thorium and uranium in urine by ICP-MS,” Mikrochim. Acta, vol.126, no. 3-4, pp. 263 – 266, Sep. 1997.
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DETERMINATION OF TRITIUM ACTIVITY CONCENTRATION IN WATER IN THE VICINITY OF NUCLEAR FACILITIES IN SERBIA

Nataša Todorović, Jovana Nikolov, Ivana Stojković, Marija Lekić, Nataša Lazarević

Pages: 103–105

DOI: 10.21175/RadProc.2018.22

Tritium is produced naturally, mainly through interactions of cosmic rays with nitrogen in the atmosphere. Human activities (including thermonuclear bomb tests, operation of nuclear reactors, manufacture of nuclear weapons, and various industrial and medical applications) are also sources of tritium. Once in the environment, tritium occurs mainly in the form of tritiated water (HTO). International legislations and national regulations are in place to impose tight controls on releases as well as to ensure regular monitoring near anthropogenic sources. Tritium monitoring of surface and well waters that supply populations with drinking water are of particular importance. The monitoring data are used to trace releases and also for the evaluation of tritium doses to nearby residents. According to the European Commission, the upper limit for tritium in water is 100Bql-1 [1]. This value was not set based on the probability of health effects. It is a monitoring tool (action level) because tritium activity concentration exceeding 100 Bql-1 could indicate a leakage or a release for which further analysis, to check if other radionuclides are present in water, would be warranted. In this paper, tritium concentrations measured in water samples collected from the Mlaka creek in the vicinity of the “Nuclear Facilities of Serbia” are presented.
  1. The European Commission. (Nov. 3, 1998). Council Directive 98/83/EC of 3 Nov. 1998 on the quality of water intended for human consumption.
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  2. J. Nikolov et al., “Tritium in Water: Hydrology and Health Implications,” in Tritium Advances in Research and Applications, M. Janković, Ed., New York (NY), USA: Nova Science Publishers, 2018, ch. 5, pp. 157 – 213.
  3. J. Nikolov et al., “Different methods for tritium determination in surface water by LSC,” Appl. Radiat. Isot., vol. 71, no. 1, pp. 51 – 56, Jan. 2013.
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  5. I. Stojković et al., “Methodology of tritium determination in aqueous samples by liquid scintillation counting techniques,” in Tritium Advances in Research and Applications, M. Janković, Ed., New York (NY), USA: Nova Science Publishers, 2018, ch. 4, pp. 99 – 157.
  6. Standard Test Method for Tritium in Drinking Water, ASTM D 4107–08, Jun. 15, 2013.
    DOI: 10.1520/D4107-08R13
  7. I. Jakonić et al., “Optimization of low-level LS counter Quantulus 1220 for tritium determination in water samples,” Radiat. Phys. Chem., vol. 98, pp. 69 – 76, May 2014.
    DOI: 10.1016/j.radphyschem.2014.01.012

Radon and Thoron

RADIOLOGICAL CHARACTERIZATION OF PORTUGUESE NATURAL MINERAL WATER

A. S. Silva, M. L. Dinis

Pages: 106–110

DOI: 10.21175/RadProc.2018.23

Natural mineral waters used in therapeutic treatments present diverse chemical composition which can include natural radionuclides, such as radon, increasing the risk of exposure to natural radiation for both workers and bathers. The purpose of the present study was to evaluate the radon concentration in natural mineral waters of 17 Portuguese thermal establishments. The evaluation was carried out between 2013 and 2015 in several places of each thermal establishment. An analysis of the compliance between the obtained values and the existing legal requirements for the different parameters concerning radon concentration in water was made. The results showed the presence of anomalous values both higher than the reference level and the action level. Approximately 50% of the obtained results are higher than the reference level recommended by the EU, while 20% of the results exceeded the action level. These results may also imply high concentrations of indoor radon (and hence occupational exposure to radon), since the natural mineral water will be a continuous source of this radionuclide. The high values obtained in some cases are worrying and show the need for a more detailed and extensive study, both in space and time.
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  2. U. A. Tarim et al., “Evaluation of radon concentration in well and tap waters in Bursa, Turkey,” Radiat. Prot. Dosim., vol. 150, no. 2, pp. 207 – 212, Jun. 2012.
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    PMid: 21990391
  3. Radon Toxicity, Agency for Toxic Substances and Disease Registry, Atlanta (GA), USA, 2010.
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  4. Radiation Protection against Radon in Workplaces other than Mines, Safety Report Series No. 33, IAEA, Vienna, Austria, 2003.
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  5. Lung Cancer Risk from Radon and Progeny and Statement on Radon, ICRP Publication 115, ICRP, Ottawa, Canada, 2010.
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  6. K. Schmid, T. Kuwet, H. Drexler, “Radon in Indoor Spaces: An underestimated risk factor for lung cancer in environmental medicine,” Dtsch. Arztebl. Int., vol. 107, no. 11, pp. 181 – 186, Mar. 2010.
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  7. Radon and cancer, Fact Sheet no. 291, WHO, Geneva, Switzerland, 2007.
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  8. Effects of Ionizing Radiation, vol. 2, UNSCEAR, New York (NY), 2009.
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  9. WHO handbook on Indoor Radon: A Public Health Perspective, WHO, Geneva, Switzerland, 2009.
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  12. A. S. Silva, M. L. Dinis, “Measurements of indoor radon and total gamma dose rate in Portuguese thermal spas,” in Occupational Safety and Hygiene IV,P. Arezes, J. S. Baptista, M. Barroso, P. Carneiro, P. Cordeiro, N. Costa, R. Melo, A. S. Miguel, G. Perestrelo, Eds., London, UK: Taylor & Francis Group, 2016. pp. 485 – 489.
  13. K. Q. Lao, Controlling indoor radon: measurement, mitigation, and prevention, New York (NY), USA: Van Nostrand Reinhold, 1990.
  14. M. Al Zoughool, D. Krewski, “Health effects of radon: a review of the literature,” Int. J. Radiat. Biol., vol. 85, no. 1, pp. 57 – 69, Jan. 2009.
    DOI: 10.1080/09553000802635054
    PMid: 19205985
  15. M. Erdogan, F. Ozdemir, N. Eren, “Measurements of radon concentration levels in thermal waters in the region of Konya, Turkey,” Isotopes Environ. Health Stud., vol. 49, no. 4, pp. 567 – 574, 2013.
    DOI: 10.1080/10256016.2013.815182
    PMid: 23937805
  16. A. S. Silva, M. L. Dinis, A. J. S. C. Pereira, “Assessment of indoor radon levels in Portuguese thermal spas,” Radioprotection, vol. 51, no. 4 pp. 249 – 254, Oct-Dec. 2016.
    DOI: 10.1051/radiopro/2016077.
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    DOI: 10.1520/D5072-09
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  21. The Council of the European Union. (Oct. 22, 2013). Directive 2013/51/EURATOM laying down requirements for the protection of the health of the general public with regard to radioactive substances in water intended for human consumption.
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  24. U. A. Tarim et al., “Evaluation of radon concentration in well and tap waters in Bursa, Turkey,” Radiat. Prot. Dosim., vol.150, no. 2, pp. 207 – 212, Jun. 2012.
    DOI: 10.1093/rpd/ncr394
    PMid: 21990391
  25. V. Radolić, B. Vuković, G. Smit, D. Stanić, J. Planinić, “Radon in the spas of Croatia,” J. Environ. Radioact., vol. 83, no. 2, pp. 191 – 198, 2005.
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  26. A. Pereira, L. Neves, C. Gomes. J. Figueiredo, A. Vicente, “Concentração do gás radão em habitações da região de Castelo Branco (Portugal Central) e factores geológicos condicionantes,” em Proc. VI Congresso Ibérico de Geoquímica e XV Semana de Geoquímica, Vila Real, Portugal, 2007. (A. Pereira, L. Neves, C. Gomes, J. Figueiredo, A. Vicente, “Gas concentration in the habitation region of Castelo Branco (Central Portugal) and geological conditioning factors,” in Proc. VI Iberian Congress of Geochemistry and XV Geochemistry Week, Vila Real, Portugal, 2007.)
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INDOOR RADON CONCENTRATION RELATED TO GEOLOGICAL AREAS AT DIFFERENT WORKPLACES OF ALBANIA

Kozeta Bode, Hamza Reci, Brunilda Daci, Elida Bylyku, Irma Bërdufi, Emanuela Kiri

Pages: 111–114

DOI: 10.21175/RadProc.2018.24

Radon exposure in the workplace is one of the main exposures to the population after that in dwellings. These workplaces are generally at the ground and/or first floor, where radon concentration is generally higher than at upper ones. This study deals with the measurements of indoor radon concentration in several workplaces located in different geological conditions. Measurements of indoor radon concentration have been carried out using passive bare detectors based on CR -39 in 50 workplaces, including one site at the Centre of Applied Nuclear Physics, Tirana. According to the principles of the methodology, the radon passive detectors have been located inside the workplaces for three months exposure, allowing the calculation of average values, which represent much better the true values of the radon concentration inside of a closed environment. The exposure time of detectors was performed during period January–April 2014. According to the assessment made by the United Nations Scientific Committee on the Effects of Atomic Radiation (UNSCEAR), radon in the natural environment constitutes about 50% of the human exposure to natural radiation or 1.2 mSv/year. The measurements were used to calculate the effective dose due to the radon contribution (mSv/y). Based on the results of the measurements, the minimum value of the radon concentration found is 53 Bq/m3 to 400 Bq/m3 in workplaces, while the reference levels are 300 Bq/m3. Around 90% of the radon concentration values are within reference levels. The results of this study represent a variation of radon concentration related to geological composition. More detailed studies are needed in areas with different geology and construction materials for a better spatial distribution of radon concentration, particularly in public places.
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  2. WHO Handbook on Indoor Radon: A Public Health Perspective, WN 615, WHO, Geneva, Switzerland, 2009.
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  3. The Council of European Union. (Dec. 5, 2013). Council Directive 96/29/ EURATOM Laying down basic safety standards for protection against the dangers arising from exposure to ionizing radiation.
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  4. K. Bode Tushe et al., “First step toward the geographical distribution of indoor radon in dwellings in Albania,” Radiat. Prot. Dosimetry, vol. 172, no. 4, pp. 488 – 495, Dec. 2016.
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    PMid: 26656073
  5. Këshilli i ministrave. (25.11.2015). No. 957 date 25.11.2015. Për miratimin e rregullores "për nivelet e lejuara të përqendrimit të radonit në ndërtesa dhe ujë, nivelet udhëzuese të radiobërthamave në materialet e ndërtimit, si dhe nivelet e lejuara të radiobërthamave në ushqime dhe produkte kozmetike". (Decision of the Council of Ministers. (Nov. 25, 2015). No. 957, dated 25.11.2015, Improving regulatory standards and concentration of indoor radon and radioactive concentration in goods, in order to protect the public.)
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ALPHA SELF-ABSORPTION EVALUATION IN RADIOMETRIC FILTER MATERIAL FOR THE NATURAL RANGE OF ALPHA ENERGY (5-9 MeV)

M. Y.A. Mostafa, M.V. Zhukovsky

Pages: 115–118

DOI: 10.21175/RadProc.2018.25

In this paper, SRIM (The Stopping and Range of Ions in Matter) software package is used to simulate the interaction of alpha particles into the material of radiometric analytical filters. The effect of alpha particle self-absorption in alpha radiometric filters measurements is estimated, especially in the range of natural alpha energy (5-9 MeV, Radon and Thoron alpha energy). Software package SRIM allows to calculate the parameters of the ions interaction with target material using a Monte Carlo simulation method based on a quantum mechanical treatment of ion-atom collisions. The effect of the radiometric analytical filter material on the transmitted efficiency of alpha energy is discussed. As the energy increases the self-absorption in analytical filter material is decreased but still has a clear effect. In this case, the filter material and the space distance between the filter and the detector window decrease the number of alpha particles which reach to the detector window.
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RADON EXHALATION RATE OF SOME BUILDING MATERIALS COMMON IN SERBIA

Dragan Avramović, Igor Čeliković, Predrag Ujić, Ivana Vukanac, Aleksandar Kandić, Aleksandar Jevremović, Dunja Antonijević, Boris Lončar

Pages: 119–122

DOI: 10.21175/RadProc.2018.26

It is well-known that radon is the second important human carcinogen for lung cancer, after smoking. The major sources of indoor radon concentrations are soil and building material. Under certain conditions, a dose received from the inhalation of radon and its progenies can be higher than a dose received from the external exposure due to radium concentration in building materials. In this contribution, the results of the radon and thoron exhalation rate measurement from 9 commonly used building materials are reported. Exhalation rate measurements were performed with accumulation chamber method using active device for measurement of radon concentration.
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ANALYSIS AND CONSTRUCTION OF THE HIGH DENSITY STORAGE RACKS FOR SPENT FUEL OF THE RESEARCH REACTOR IEA-R1

Antonio Carlos Iglesias Rodrigues, Tufic Madi Filho, Davilson Gomes da Silva

Pages: 123–126

DOI: 10.21175/RadProc.2018.27

The IEA-R1 research reactor works 40h weekly, with 4.5 Mw power. The storage rack for spent fuel elements has less than half of its initial capacity. Under these conditions, the reactor operating for 32h/week will have 3 spent fuel by year, approximately 3 utilization rate Positions/year; thus, we will have only about six years of capacity for storage. Since the desired service life of the IEA-R1 is at least another 20 years, it will be necessary to increase the storage capacity of spent fuel by doubling the wet storage in the reactor’s pool. 3M’s neutron absorber BoralcanTM was chosen after reviewing the literature about available materials for the construction of a new storage rack. This work presents studies for the construction of new storage racks with double of capacity using the same place of the current ones. Criticality safety analysis was performed with MCNP-5 Monte Carlo code, using two Evaluated Nuclear Data Files (ENDF/B-VI and ENDF/B-VII) in calculations, and subsequently, the results were compared. The full charge of the storage rack with only new fuel elements (maximum reactivity) was considered to calculate the keff. The results obtained in the simulations show that it is possible doubling the storage capacity of the spent fuel elements. Additionally, it complies with safety limits established by International Atomic Energy Agency (IAEA) and Brazilian Commission of Nuclear Energy (CNEN) standards to the criticality criteria (keff <0.95). This is only possible with the use of neutron absorber material.
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Radiation Detectors

DETERMINATION OF STRUCTURAL AND PHOTOELECTRIC CHARACTERISTICS OF ZnO POLYCRYSTALLINЕ THIN FILMS AND ZnO NANOROD ARRAYS OBTAINED BY SPRAY PYROLYSIS

Atanas Tanushevski, Maja Lazarova, Ivan Boev

Pages: 127–131

DOI: 10.21175/RadProc.2018.28

ZnO polycrystalline thin films and ZnO nanorod arrays were obtained by the spray pyrolysis method at a substrate temperature of 450 °C. By analyzing the XRD diffractograms, the hexagonal crystal structure of the ZnO films and ZnO nanorods was determined. On the other hand, the grain size of the films and nanorods was determined using the Debye-Scherrer equation. The optical properties of the films and nanorods were determined by measuring the dependence of the transmission on the wavelength of the light. Also, the optical band gap of 3.28 eV for the ZnO films and 3.21 eV for the ZnO nanorods was estimated. The photoconductivity spectrum of thin films and nanorods was recorded in the visible light range and their photoconductivity was studied when they were illuminated by X-rays, where the incident X-rays increase the conductivity of thin films of nanorods. The surface morphologies of the ZnO films and the ZnO nanorods, as well as the grain size of the film and the dimensions of the nanorods, were studied by a scanning electron microscope.
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myOSL – A NEW SERIES OF PORTABLE AND STATIONARY EQUIPMENT FOR OSL-DOSIMETRY BASED ON BeO

D. Richter, I. Słonecka, S. Schischke, K. Dornich

Pages: 132–137

DOI: 10.21175/RadProc.2018.29

A new series of dosimetric devices, based on the optically stimulated luminescence (OSL) of BeO, is presented. The dosimetric properties of BeO and the use of OSL are favorable with a linear range at least up to 10 Sv, near tissue energy response, and because of the use of OSL as a measurement technique, the dose information can be re-read. The myOSLraser device combines measurement and zeroing equipment in a single unit and is thus cost and time efficient. The manual reader for single myOSLdosimeters, consisting of two BeO-elements for Hp(0.07) and Hp(10), can be expanded by myOSLautomation, which allows a fully automated analysis of 200 dosimeters. The system exceeds the requirements of EN/IEC 62387. A truly portable handheld device (myOSLchip) allows the manual operation of single element dosimeters, e.g. in phantoms. A simple method is proposed to use the OSL decay signal for the normalization of equipment and bringing into line the sensitivity between instruments.
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A STUDY OF USING POLYCARBONATE AS A REUSABLE RADIOCHROMIC INTEGRATING DOSIMETER FOR THE DETERMINATION OF HIGH DOSES OF IONIZING RADIATION

David Zoul, Martin Cabalka, Markéta Koplová

Pages: 138–142

DOI: 10.21175/RadProc.2018.30

The aim of this research is to study the use of polycarbonate as a reusable radiochromic integrating dosimeter for the determination of high doses of ionizing radiation in the (range of 0.1 to 10 kGy). The region of the linear dependence of the optical density of polycarbonate samples on gamma radiation dose, as well as the fading of the radiation effect and the possibility of accelerating this fading by annealing have been explored. To determine the effect of oxygen concentration on changes in optical density and the rate of oxygen diffusion into the polycarbonate, some samples were stored in a pure oxygen atmosphere, produced by electrolytic dissociation of distilled water using a fuel cell.
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Radiation Effects

HIGH PREVALENCE OF CHRONIC LYMPHOCYTIC LEUKEMIA AND B-CELL LYMPHOMAS IN NUCLEAR WORKERS AFTER THE INCORPORATION OF ALPHA EMITTERS: CASE REPORT AND REVIEW OF THE LITERATURE

Roland Wolff, Rainer Frentzel-Beyme, Inge Schmitz-Feuerhake

Pages: 143–148

DOI: 10.21175/RadProc.2018.31

Chronic lymphatic leukemia (CLL) was formerly considered to be a non-radiogenic form of cancer. Non-Hodgkin Lymphomas (NHL) were supposed to be very rare after radiation exposure. These historical estimations were based on the early observations of the Japanese A-bomb survivors. In contrast to these conclusions, increasing rates of CLL and NHL were found in the last decades in nuclear workers and liquidators of Chernobyl, i.e. in cases of low dose chronic exposure. Estimating the dose response, the authors generally refer to the bone marrow as the corresponding target organ which often leads to surprisingly high-risk figures for the radiation effect. We recently investigated three cases of people suffering from B-lymphocyte proliferation (two CLLs and one lymphoma) who were involved in the decontamination of nuclear establishments, because Germany decided to go out of nuclear energy, and they started tearing down the plants. The men worked in the same enterprise, were exposed to external doses of 46, 108 and 116 mSv, and had certainly inhaled alpha emitters such as uranium and plutonium isotopes. In the 1980s, radiation hematologists stated that the bone marrow should not be considered as the relevant target of B-cell lymphomas and CLL of B-cell type because the effect results in a proliferation of mature B lymphocytes which mainly occur outside the bone marrow. Therefore, the diseases may be induced in the whole pool of B lymphocytes including all peripheral locations also comprising lymph nodes and lymphatic organs. Our impression is that CLL and NHL are initiated predominantly at workplaces where the possibility of open radioactivity exists: in uranium mines, uranium and radium processing facilities, nuclear facilities, and consequently in liquidators. Several studies involving animals and humans have shown that incorporated radionuclides such as uranium, thorium, and plutonium concentrate in the lymph nodes leading to higher radiation doses to the lymphocytes than are provided in other tissues. This effect is explained by the immunological reaction of macrophages functioning as scavengers of particles such as materials emitting alpha-radiation. These cells circulating via the lymph vessels are stored in the stationary lymph nodes. If the target organ for dosimetry must be seen in all mature B lymphocytes in the body, this will be valid for all kinds of external and internal exposures. Except in cases of homogeneous whole-body exposure, any dose estimation will be extremely unsafe or – as in our examples – not possible. These limitations must be considered when planning the radiation protection strategies for nuclear workers and adequate evaluation in compensation cases.
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Medical Physics

IN-BEAM PET MONITORING TECHNIQUE FOR PROTON THERAPY: EXPERIMENTAL DATA AND MONTE CARLO PREDICTION

A. Topi et al.

Pages: 149–153

DOI: 10.21175/RadProc.2018.32

Charged particle therapy is a precise radiotherapy method for the treatment of solid tumors. This method can deliver conformal dose distributions minimizing damage to healthy tissues thanks to its characteristic dose profile. However, the steep dose profile of charged particle beams (due to the Bragg peak) can result in over- or under-dosage in critical regions. Monitoring the range of the charged particles is therefore highly desirable. In this study, we use a planar in-beam PET system for the range verification of pencil beams in proton therapy. The planar geometry of the DoPET system is advantageous because it can be used online, i.e., during treatment. In the particle therapy community, the Monte Carlo (MC) codes are widely used to evaluate the radiation transport and interaction with matter. For this reason, the FLUKA MC code was used to simulate the experimental conditions of irradiations performed at the Cyclotron Centre Bronowice (CCB) proton therapy center in Krakow (PL). 130MeV pencil beams were delivered on phantoms mimicking human tissues. Different acquisitions are analyzed and compared with the MC predictions. The image reconstruction for experimental data and simulation is based on the Maximum Likelihood Estimation Method (MLEM) algorithm. A special focus in the paper will be on the validation of the PET detector response for activity range verification.
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SEGMENTATION OF HEMATOPOIETIC SITES OF HUMAN SKELETON FOR CALCULATIONS OF DOSE TO ACTIVE MARROW EXPOSED TO BONE-SEEKING RADIONUCLIDES

P.A. Sharagin, E.A. Shishkina, E.I. Tolstykh, A.Yu. Volchkova, M.A. Smith, M.O. Degteva

Pages: 154–158

DOI: 10.21175/RadProc.2018.33

The Techa River (the Urals, Russia) was heavily contaminated due to the release of radionuclides from the Mayak Production Association. The radioactive releases included bone-seeking beta-emitters such as 90Sr and 89Sr that contribute to doses to bone marrow. Moreover, 90Sr is a long-lived isotope, the uptake of which leads to a chronic bone marrow exposure known to result in an increased risk of leukemias. Ongoing epidemiological studies of the long-term effects of chronic radiation exposure are being performed for the Techa River Cohort members. Radiation dosimetry is a part of this study, of which, the internal dose estimates for active bone marrow exposed to beta emission of Sr isotopes incorporated in calcified tissue is an important component. Internal dose calculations, which are based on electron-photon transport simulations, require geometrical descriptions of bone shapes and bone microstructures of the main hematopoietic sites of the human skeleton (ribs, vertebrae, pelvic bones, femur, humeri, bones of the skull, sternum, clavicle and scapula). For this purpose, the parametric approach for modeling bone geometry was elaborated. The proposed approach can be used to segment and define each of the bone sites as simple geometric shapes for which parameters can be derived. The aim of the paper is to present the principles of bone segmentation. Dose factors that convert the activity concentration of bone-seeking radionuclides into a corresponding bone marrow dose rate were calculated for each segment. The calculations were done with MCNP6. The bone segmentation allows optimizing the size of the computational phantom (in terms of voxel number), substituting the complex–shaped bone model with a set of simple stylized phantoms and taking into account the heterogeneity of bone microstructure.
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Radiology

THORACO-ABDOMINAL TRIPHASIC CT IN ONCOLOGIC FOLLOW-UP: ASSESSMENT AND ADVANTAGES OF “LOW DOSE” PROTOCOL

Andrea Bonfanti, Elena Ciortan, Luciano Abate, Ruggero Luigi Baroni, Serena Padelli, Roberto Moltrasi

Pages: 159–162

DOI: 10.21175/RadProc.2018.34

The objective was to compare the contrast enhanced computed tomography (CT) “LOW DOSE” protocol for thoraco-abdominal scans, with the standard CT protocol for oncologic follow up. We analyzed these two different imaging techniques and the overall radiation dose in order to determine benefits in terms of diagnosis. We included 50 patients where oncologic follow up included a triphasic thoraco-abdominal CT for staging of liver disease. Eligibility criteria were the medical indication for a contrast-enhanced thoraco-abdominal CT as part of an oncologic follow up (breast cancer, hepatocarcinoma, neuroendocrine tumors, kidney cancer and prostatic cancer) and the availability of previous enhanced CT scans performed over the past year of follow up. The LOW DOSE protocol for triphasic CT in oncologic follow up permits saving of effective dose up to 50% (27% on average) for each scan and an overall saving of up to 40% (15% on average) for complete procedure in the normal BMI group. The LOW DOSE protocol was also effective in the diagnosis of thromboembolic disease. All the scans from the LOW DOSE CT protocol were analyzed by radiologists, all with at least 10 years of experience, unaware of the introduction of the protocol – there were no reported differences or difficulties in diagnosis compared to the standard CT protocol.
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PULMONARY DUST DISEASES IN BULGARIA

Elisaveta Petrova

Pages: 163–165

DOI: 10.21175/RadProc.2018.35

The aim of the study was to present the epidemiological characteristics, new diagnostics trends and prevention of the pulmonary diseases related to dust (PDD) in Bulgaria. Retrospective epidemiological study during the period 1980-2003 y. was done. A new cross sectional case control study of workers exposed to high concentration mineral dust and non-exposed control group in 2003 year were performed. Non patrametric, correlation analysis and linear statidstical analysis were performed. An SPSS statistical package was used. Epidemiological trends of different types of pneumoconiosis, and 11 years study of tendencies in malignant mesothelioma in the country were analyzed. A prognosis of the appearance of PDD during the future 10 – 30 years was done. A comparison between chest radiographic images and HRCT amongst pneumoconiotic patients was done. Image/functional constellations for diagnostic purposes were created. The following conclusions can be made: 1. PDD play a leading epidemiological role amongst occupational diseases in Bulgaria. 2. An appearance of pneumoconiosis and asbestos-related malignant mesothelioma in the next 10 – 20 years was expected. 3. HRCT, as well as constellation HRCT/VC, FVC and FEF50% could be more correct diagnostic methods in pneumoconioses.
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Nuclear Medicine

ENSURING PROTECTION AND SAFETY IN THE HANDLING OF A DECEASED PERSON THAT IS KNOWN TO CONTAIN AN UNSEALED RADIOACTIVE SOURCE AS A RESULT OF MEDICAL TREATMENT - HEALTH AUTHORITY CASE STUDY

Fulger Ciupagea, Gabriela Rosca Fartat, Marina Anghene, Nuta Niculaie, Anca Zamfirescu, Cristina Petroiu, Costin Ghioca

Pages: 166–168

DOI: 10.21175/RadProc.2018.36

Radioactive sources used for therapy can cause very serious exposures if they are mislaid or misused. The aim of this paper is to present the measures taken in order to ensure the radiation protection in the handling of a deceased person containing I-131. The prominent pathways of exposure for occupational exposed personnel, medical exposure (family, friends) and public exposure (third person e.q. (the mortuary car driver, priest) were assessed. According to these specific conditions, the time after which the body can be taken over by the family was calculated and the doses in the handling of the deceased person, embalming, transport and burial ceremony were evaluated for each category of people. Also, the compliance with national legislation and European recommendations is discussed.
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Radiotherapy

MEGAVOLTAGE COMPUTED TOMOGRAPHY (MVCT) DOSE ASSESSMENT AT DIFFERENT DEPTHS

Sibel Karaca, Hamit Başaran

Pages: 169–173

DOI: 10.21175/RadProc.2018.37

The aim of the study is to evaluate the point doses measured by different parameters at various depths with MVCT in the Tomotherapy Hi- Art (HT) treatment unit. HT works in two modes: visual modes and therapy modes. The MVCT images are taken in the visual mode. The user can choose the scan length and image pitch value in the visual mode. The system has pitch values called fine, normal and coarse. When the same volume is scanned during the gentry rotation, the scan times of fine, normal, and coarse modes are different from one another. Cheese Phantom is used to evaluate the point doses. The measured values ranged from 0.64 to 2.67 cGy with an average dose of 1.40cGy. The lowest MVCT dose is found when 7 slices are scanned with a depth of 20 cm for 51 seconds. The highest MVCT dose is found when 17 slices are scanned with a depth of 15 cm for 101 seconds. The measured values are the highest when the fine mode is selected with low depth and high slice. The IGRT method is used before each treatment and can be used more than once if necessary. Therefore, the right mode selection can prevent taking unnecessary doses during MVCT.
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Environmental Chemistry

USE OF THE NEUTRON ACTIVATION ANALYSIS TECHNIQUE TO DETERMINE HEAVY METALS IN NICOTIANA TABACUM SOLANACEAE

Tufic Madi Filho, Elson Barros Ferreira, Maria da Conceição Costa Pereira, José Roberto Berretta

Pages: 174–180

DOI: 10.21175/RadProc.2018.38

Tobacco addiction has been mentioned as a leading cause of preventable illnesses and premature disability since tobacco smoking is the main cause of lung cancer and one of the factors that most contribute to the occurrence of heart diseases, among others. The herbaceous species Nicotiana tabacum is a plant of the solanaceae family used for tobacco production. Some authors have conducted research about heavy metals and the toxicity of tobacco. It is, frequently, found in low concentrations in the ground, superficial and underground waters, even though they do not have environmental anthropogenic contributions. However, with the increase of industrial activities and mining together with the agrochemical use of contaminated organic and inorganic fertilizers, an alteration of the geochemical cycle occurs. As a consequence, the natural flow of that materials increases and release into the biosphere, where they are often accumulated in the superior layer of the ground, accessible to the roots of the plants. During planting and plant development, fertilizers and insecticides, including organochlorines and organophosphates, are used; consequently, the smoke from cigarette smoking presents various toxic substances, including heavy metals, such as Chromium (Cr), Manganese (Mn) and Antimony (Sb). Elements studied in this work. The procedures for the preparation of the samples were carried out in our laboratories and submitted to irradiation with thermal neutrons at IPEN/CNEN-SP, in the IEA-R1 research reactor. The irradiated material was, then, analyzed by gamma spectrometry, using a high purity germanium detector (HPGe).
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INCOMPATIBLE ELEMENTS IN BOTTOM SEDIMENTS OF THE ACARAY DAM RESERVOIR

J.F. Facetti-Masulli, Peter Kump, Virginia Romero

Pages: 181–186

DOI: 10.21175/RadProc.2018.39

Incompatible elements (IE) from the bottom sediments of the Acaray Reservoir in the Alto Paraná region of Eastern Paraguay were investigated by the EDXRF technique. Most of them are refractory, that is, they maintain their primary relationships and are transferred almost directly into sediments and thus, they are considered as geoindicators. In this regard, IE are of utmost interest in sediments studies. The refractory trace elements analyzed were Y-Rb-Sr-Zr-Nb-Ba-La-Ce-Nd, and the minor elements Ti-Mn-Fe. The analyses were performed with an Am-241 source and an X-ray tube. Samples were taken from six different stations. Like the sediments of the Itaipu Dam, spidergram results show an enrichment of IE and contributions of sedimentary material to the bottom sediments of the Acaray Reservoir.
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Microwave, Laser, RF and UV radiations

UV INDEX FORECASTING IN VOJVODINA REGION

Zorica Podrascanin, Milica Atlagic, Zoran Mijatovic, Ana Firanj Sremac

Pages: 187–190

DOI: 10.21175/RadProc.2018.40

The UV index (UVI) values were calculated by an empirical model over Novi Sad (19.8 E, 45.3 N, 84 m), Vojvodina region, Serbia, on clear sky days in all seasons. The ground-based ozone measurements for this location, the solar zenith angles and the distance from the Sun were used as input data for the model. At the same site, the UVI values were measured by a Yankee Environmental Systems (YES) UVB-1 pyranometer. The measured values were compared to the calculated values. This comparison was performed to improve this model for UVI forecast in the Vojvodina region. The differences between the modeled and measured data are small enough with root-mean-square differences of less than 0.8 in summer and 0.3 in winter, so we can conclude that this model could be used for UVI forecast for clear sky conditions in this region.
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EVALUATION OF ELECTROMAGNETIC FIELD EXPOSURE OF GENERAL PUBLIC AROUND TELECOMMUNICATION SOURCES

M. Ivanova, Ts. Shalamanova, V. Zaryabova, P. Ivanova, Iv. Topalova, M. Israel

Pages: 191–196

DOI: 10.21175/RadProc.2018.41

The exposure to radiofrequency electromagnetic fields (RF EMF) in the living environment is due to variety of sources, predominantly for telecommunications – radio and TV stations and base stations for mobile communication emitting in the frequency range from 100 kHz to several GHz. In recent years research has shown that such systems have significantly increased RF EMF levels in urban areas compared to those measured in the 1980s, when the major sources in the environment were analogue radio and television stations. The aim of the report is to present the assessment of electromagnetic field exposure to the general public from telecommunication sources on the territory of the country. Separate data from measurement and exposure assessment of RF EMF levels around base stations for mobile communication and Radio and TV stations are considered. The data contain results of spot measurements of RF EMF levels emitted by separate base stations for mobile communication and radio and TV stations and spot measurements in areas with a high density of RF EMF sources – 105 regions in the country. It covers 1376 base stations and 280 radio and TV stations. The received results show that RF EMF levels are below the permissible levels according to the national legislation. Higher values, within the exposure limits, are found in areas with large number of sources or when the emitters are mounted on small height, but in such cases the values are less than 30% of those in national legislation. Compared to the European legislation the registered RF EMF levels are below 1 % of exposure limits. The measured values of the electric field strengths and power densities around the radio and television stations are within the exposure limits according to the national legislation. Values above exposure limits have been found in 1-2% of cases, but they were measured outside the urban areas where only incidental stay of the general public is possible. In comparison to the European legislation (Council Recommendation 1999/519/ЕС) measured values of the electric field strength and power density around radio and TV stations are well below the limit values.
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OCCUPATIONAL EXPOSURE TO ELECTROMAGNETIC FIELD - TRANSPOSITION OF THE EUROPEAN POLICY

Michel Israel, Mihaela Ivanova, Victoria Zaryabova, Tsvetelina Shalamanova, Petya Ivanova

Pages: 197–201

DOI: 10.21175/RadProc.2018.42

The health policy connected with electromagnetic fields’ exposure of workers in Europe was developed on the basis of the ICNIRP Guidelines through the implementation of the Directive 2013/35/EC. The transposition of the EU Directive into the national legislation is a large process including the implementation of an ordinance, training of employers and workers, occupational health services, specialists performing measurements. An additional activity is the development of standard methods of risk assessment for practical implementation valid for concrete occupations and workplaces. Special attention should be paid to the workplaces with magnetic resonance imaging.
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Medical Imaging

3D RECONSTRUCTION OF INNER STRUCTURE OF RADIOACTIVE SAMPLE UTILIZING GAMMA TOMOGRAPHY

David Zoul, Pavel Zháňal

Pages: 202–206

DOI: 10.21175/RadProc.2018.43

A unique 3D tomography apparatus was built and successfully tested in Research Centre Rez. The apparatus allows a three-dimensional view into the interior of low-dimension radioactive samples with a diameter up to several tens of millimeters giving a better resolution than one cubic millimeter and it is designed to detect domains with different levels of radioactivity. Structural inhomogeneities such as cavities, cracks or regions with different chemical composition can be detected by using this equipment. The SPECT scanner has been successfully tested on several samples composed of a 3mm radionuclide source located eccentrically within homogeneous steel bushings. To detect fine cracks inside small samples an ultrafine scan of the sample was carried out in the course of 24 hours with a 0.5 mm longitudinal and transverse step and 18° angular step. The exact location and orientation of a fine crack artificially formed inside a sample has been detected.
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Pharmaceutical Sciences

INADEQUATE USE OF HERBAL DIETARY SUPPLEMENTS AMONG PATIENTS UNDER CHRONIC TREATMENT

Maja Cvetković, Dušan Ilić, Dušica Stojanović

Pages: 207–212

DOI: 10.21175/RadProc.2018.44

The use of herbal supplements and medicines is increasing rapidly as most people consider them to be of natural origin and therefore safe. Many herbal medications are used to treat diseases but while they are often efficacious, their safety has not sufficiently been considered by physicians or users. One particular safety concern is the risk of interactions with drugs, which often leads to toxicity or loss of therapeutic efficacy. A significant number of patients combine herbal remedies with prescription medications and there is growing evidence for interactions of drugs with herbal remedies or single compound originating from plants. The aim of this paper is to evaluate the possible interactions between chronic patient therapy and herbal substances. The research is presented as a descriptive study which included patients of 30 to 80 years of age, who were randomly selected in Niš from September to December 2017 and agreed to be interviewed as well as completed the questionnaires. We surveyed 157 patients, 115 respondents (73.24%) reported use of dietary supplements. In total, 105 (66.87%) interactions with potential clinical significance were identified. The 5 most common natural products with a potential for interaction (garlic, valerian, ginkgo, and St John’s wort) accounted for 68% of the potential clinically significant interactions. The 4 most common classes of prescription medications with a potential for interaction (antithrombotic medications, sedatives, antidepressant agents, and antidiabetic agents) accounted for 94% of the potential clinically significant interactions. No patient was harmed seriously from any interaction. It is an imperative that pharmacists and doctors ask patients what they are using within their chronic illness treatment and estimate the possible use of a dietary supplement based on the data obtained.
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Biochemistry

BILIRUBIN-RIBOFLAVIN MUTUAL INTERACTION IN METHANOL UNDER CONTINUOUS UV IRRADIATION REGIME

Jelena S. Stanojević, Dragan J. Cvetković, Jelena B. Zvezdanović, Ljiljana P. Stanojević, Dejan Z. Marković†

Pages: 213–219

DOI: 10.21175/RadProc.2018.45

The aim of the present study was to consider bilirubin (BRB) and riboflavin (RFL) mutual interaction in methanol solution under continuous UV-A and UV-B irradiation regime. Continuous irradiations of samples were performed in a cylindrical photochemical reactor “Rayonet”, with 10 symmetrically placed lamps having the emission maximum at 300 nm (UV-B) and 350 nm (UV-A). The rate of BRB and RFL photodegradation along with simultaneous products formation, as a function of UV exposure time, was followed by combining UV-VIS absorption measurements with RP-HPLC analysis. The compounds were separated by gradient elution with mobile phase A (formic acid, 0.1% water solution) and B (formic acid, 0.1% methanol solution). According to the results obtained, BRB degradation in the absence of RFL was almost 22 times and 9 times slower in comparison to its degradation observed in BRB-RFL mixture under continuous UV-A and UV-B irradiation, respectively. Moreover, BRB degradation in BRB-RFL mixture under anaerobic conditions was almost 24 times and 16 times slower in comparison to the degradation in aerobic conditions under UV-A and UV-B light, respectively. The latter observation suggests that presence of ROS species contributes to UV-induced BRB degradation. These experiments provide the indirect proof of BRB acting as Type II sensitizer because of the fact that 1O2 produced by RFL mediates BRB irreversible degradation giving rise to dipyrrole methanol adducts as typical products obtained via Type II mechanism.
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Biophysics

RADIATION HORMESIS IN THE LIGHT OF THE LAWS OF QUANTUM THERMODYNAMICS

Yu. P. Chukova

Pages: 220–224

DOI: 10.21175/RadProc.2018.46

Radioactivity is perceived as the most terrible danger by regular people. Radioactivity has always been studied in such aspect. Therefore, the occurrence of messages about the useful effects of a weak influence of radioactivity has caused counteraction and has generated the debate lasting till this moment. Thermodynamics is capable of bringing clarity to this problem. Else, in the 19th century, thermodynamics discovered two types of interactions of the system with the environment. In one case, the volume and entropy are constant in a system, and in the second one, the volume and temperature remain constant. The process in the second case is called an isothermal one and in the first case - a thermal one. Quantum thermodynamics was developed in the second half of the 20th century for electromagnetic radiation. It was shown that isothermal processes take place at weak influence on the system, and the thermal ones - at strong influences. Let us pay attention to the fact that the logarithmic scale for the absorbed energy is used for isothermal processes, and the linear scale is used for thermal processes. The logarithmic scale allows to uncover what is hidden in the zero point of thermal processes. In the previous reports of the author at RAD 2012, 2014, 2017 conferences, it was shown that quantum thermodynamics is valid for all three parts of radiation (α-, β- ,γ--radiation) and not only for γ-radiation. The application of the thermodynamic theory to hormesis effects allows us to provide a fresh insight on the essence of proceeding processes. For the experimenters who recorded a U-curve of a dose-effect dependence, it is useful to understand and remember that they study the identical answer of an organism which is a result of two fundamentally different processes: the left branch of the U-curve shows the end of the processes of a weak influence on an organism, and the right branch is the beginning of the effect of strong influences. Strong influences give a linear (or close to it) dose-effect dependence. They have been studied comprehensively and for a long time, and they are object of a hygienic standardization. Among the investigators studying strong influences, there is a different view on the threshold for a dangerous action: some consider dangerous even the smallest doses, and others reject any effects of doses below the threshold. Maybe they are excused by their ignorance of thermodynamics, especially if one is to consider that in thermodynamics there is no concept of harm. But if experimenters wish to deeply understand the essence of the processes they study, they should get acquainted with the general laws of quantum thermodynamics. Then, it would become clear to them why hormesis was found not only in radiobiology, but also in many other sciences. Hormesis is fixed by any experimenter working in a certain range of influences where the system changes the type of its answer to environmental influences (boundary of isothermal and thermal processes).
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Biomechanics

KINETIC ENERGY OF HOMOLOGUE CHROMOSOME PAIRS IN A BIOMECHANICAL OSCILLATORY MODEL OF THE MITOTIC SPINDLE

Andjelka Hedrih, Katica (Stevanović) Hedrih

Pages: 225–230

DOI: 10.21175/RadProc.2018.47

The aim of this work is to study how different oscillatory behavior of centrosomes and their mass arrangement affect the kinetic energy of pairs of dyads of sister chromatids in the system of a mitotic spindle during metaphase. The analyses are done through a biomechanical oscillatory model of the mitotic spindle. Analytical expressions for the kinetic energy of the oscillating dyads of sister chromatids are given for the case when the biomechanical system of the mitotic spindle is conservative, linear, and when it oscillates under external single frequency oscillation. Numerical analyses with some approximation for mouse chromosomes are done. Our numerical experiment reveals that the kinetic energy of the oscillating dyads of sister chromatids has an oscillatory character and is affected by the chromosomes’ mass distribution and the frequency of centrosome excitation. The difference in energy distribution regarding different centrosome oscillatory frequencies in the same cell and the mass chromosome distribution may carry additional epigenetic information and could be important for the process of cell differentiation.
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Other topics

A QUANTUM CHEMICAL INVESTIGATION OF N1-SUBSTITUTED 1,2,4-TRIAZOLE

Vesna Dimova, Mirjana S. Jankulovska, Milena Jankulovska

Pages: 231–235

DOI: 10.21175/RadProc.2018.48

The molecular conformations and electronic properties of a set of five N1-(o/p-substituted phenyl)aminomethyl-1,2,4-triazole derivatives (PhAMT) were investigated by two semiempirical methods: AM1 and PM3. Characteristic bond lengths (N1-C2, C2-H6, C2-N3, N3-N4, N4-C5, C5-H7 and N1 - C5), angles (N1-C2-N3, C2-N3-N4, N3-N4-C5, N4-C5-N1 and C5-N1-C2) and atomic charges (N1, C2, N3, N4, C5, H6 and H7) for 1,2,4-triazole core were calculated and discussed in accordance with literature data for similar 1,2,4-triazole compounds. The EHOMO and ELUMO values, total energies, the heats of formation and dipole moments values were calculated, as well. The discussion was performed in accordance with the type and position of a substituent present in the aromatic core.

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THE STUDY OF THE INFLUENCE OF ADDITIVES IN THE CRYSTALLINITY OF RECYCLED LDPE BY IR AND XRD ANALYSIS

B. Papajanı, E. Vataj, A.V. Hasımı, A. Sınanaj

Pages: 236–240

DOI: 10.21175/RadProc.2018.49

In this study, the influence of additives used during the recycling process, to the crystallinity of LDPE was analyzed. The usage of LDPE recycled is growing, as well as other types of recycled plastics, due to its flexibility and other properties. The spectroscopic method of infrared vibration is used for microstructure analysis of the samples. The presence of low-intensity peaks to infrared spectrum at 1300-800 cm-1 for all samples indicates the presence of additives. The additives used in the recycled polymers influence their degree of crystallinity that is closely linked with their physical and mechanical properties. Due to the different rates of crystallinity the samples show different intensities of peak at 726 cm-1. XRD techniques are used to calculate the degree of crystallinity and to study the phase compound of recycled LDPE. Rutile’s and calcite’s peak were identified by diffractgrams analyses as the additives added in the recycled LDPE.
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