Pub Date : 2023-03-25DOI: 10.15407/jnpae2023.01.060
Yu.P. Hrynevych, L. Makovetska, A.I. Lуpska, O. Burdo
The effect of total single X-ray irradiation (1.5 Gy) on the course of free radical processes (FRP) in the blood and liver of red fistula (Myodes glareolus) and yellow-throated mouse (Apodemus flavicollis) was studied. It is shown that physicochemical regulation of FRP in the blood of murine rodents under total X-ray irradiation (1.5 Gy) in the early stages is carried out mainly due to catalase and reduced glutathione (GSH). This is evidenced by the stoichiometry of the CL reaction and symbat changes in the prooxidant-antioxidant ratio (PAR) and basic kinetic parameters of the CL reaction (Imax, Ifin) and antibat changes to PAR - catalase and GSH.
{"title":"Prooxidant-antioxidant processes in blood and liver of murine rodents (Myodes glareolus and Apodemus flavicollis) under single irradiation","authors":"Yu.P. Hrynevych, L. Makovetska, A.I. Lуpska, O. Burdo","doi":"10.15407/jnpae2023.01.060","DOIUrl":"https://doi.org/10.15407/jnpae2023.01.060","url":null,"abstract":"The effect of total single X-ray irradiation (1.5 Gy) on the course of free radical processes (FRP) in the blood and liver of red fistula (Myodes glareolus) and yellow-throated mouse (Apodemus flavicollis) was studied. It is shown that physicochemical regulation of FRP in the blood of murine rodents under total X-ray irradiation (1.5 Gy) in the early stages is carried out mainly due to catalase and reduced glutathione (GSH). This is evidenced by the stoichiometry of the CL reaction and symbat changes in the prooxidant-antioxidant ratio (PAR) and basic kinetic parameters of the CL reaction (Imax, Ifin) and antibat changes to PAR - catalase and GSH.","PeriodicalId":42588,"journal":{"name":"Nuclear Physics and Atomic Energy","volume":"135 1","pages":""},"PeriodicalIF":0.3,"publicationDate":"2023-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74842158","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-03-25DOI: 10.15407/jnpae2023.01.027
T.I. Mosiuk, R. Vernydub, P. Lytovchenko, Yu.B. Myroshnichenko, D. Stratilat, V. Tartachnyk, V. Shlapatska
We studied light-emitting diodes (LEDs) with quantum dots маde on the basis of a solid solution of In0.21Ga0.79N. Measurements of current-voltage characteristics and electroluminescence characteristics were carried out in the range of 77 ÷ 300 K. On the current-voltage characteristics in the range of 77 ÷ 150 K, areas of negative differential resistance, as well as a fine structure of radiation spectra, were detected. The results of the influence of electron irradiation (Ee = 2 MeV) on electroluminescence characteristics intensity and quantum yield of the studied samples are presented; the features of the temperature dependence of the glow intensity of irradiated LEDs were revealed.
{"title":"Influence of electron irradiation with E = 2 MeV on electrophysical and optical characteristics of green InGaN/GaN LEDs","authors":"T.I. Mosiuk, R. Vernydub, P. Lytovchenko, Yu.B. Myroshnichenko, D. Stratilat, V. Tartachnyk, V. Shlapatska","doi":"10.15407/jnpae2023.01.027","DOIUrl":"https://doi.org/10.15407/jnpae2023.01.027","url":null,"abstract":"We studied light-emitting diodes (LEDs) with quantum dots маde on the basis of a solid solution of In0.21Ga0.79N. Measurements of current-voltage characteristics and electroluminescence characteristics were carried out in the range of 77 ÷ 300 K. On the current-voltage characteristics in the range of 77 ÷ 150 K, areas of negative differential resistance, as well as a fine structure of radiation spectra, were detected. The results of the influence of electron irradiation (Ee = 2 MeV) on electroluminescence characteristics intensity and quantum yield of the studied samples are presented; the features of the temperature dependence of the glow intensity of irradiated LEDs were revealed.","PeriodicalId":42588,"journal":{"name":"Nuclear Physics and Atomic Energy","volume":"34 1","pages":""},"PeriodicalIF":0.3,"publicationDate":"2023-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83503314","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-12-25DOI: 10.15407/jnpae2022.04.255
A. Shirinyan, Y. Bilogorodskyy, O. Krit
A new thermodynamic approach for phase stability of a nanoscale material under irradiation taking into account Gibbs free energy of phase formation and nucleation is proposed. The influence of powder dispersion and vacancy saturation on the radiation stability and phase changes of spherical Ferrum nanoparticles during irradiation is determined. The paper shows the possibility of a radiation-induced α-Fe → γ-Fe polymorphic transition, and also defines the radiation stability zones of Ferrum nanoparticles. It is shown that the competition between the energy of the accumulated vacancies in the particle, the bulk energy of the phase transformation, and the surface energy of the particle is responsible for the specific behavior of irradiated nanocrystalline Ferrum.
{"title":"Phase stability of spherical Ferrum nanoparticles under radiation saturation with vacancies","authors":"A. Shirinyan, Y. Bilogorodskyy, O. Krit","doi":"10.15407/jnpae2022.04.255","DOIUrl":"https://doi.org/10.15407/jnpae2022.04.255","url":null,"abstract":"A new thermodynamic approach for phase stability of a nanoscale material under irradiation taking into account Gibbs free energy of phase formation and nucleation is proposed. The influence of powder dispersion and vacancy saturation on the radiation stability and phase changes of spherical Ferrum nanoparticles during irradiation is determined. The paper shows the possibility of a radiation-induced α-Fe → γ-Fe polymorphic transition, and also defines the radiation stability zones of Ferrum nanoparticles. It is shown that the competition between the energy of the accumulated vacancies in the particle, the bulk energy of the phase transformation, and the surface energy of the particle is responsible for the specific behavior of irradiated nanocrystalline Ferrum.","PeriodicalId":42588,"journal":{"name":"Nuclear Physics and Atomic Energy","volume":"29 1","pages":""},"PeriodicalIF":0.3,"publicationDate":"2022-12-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90557369","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-12-25DOI: 10.15407/jnpae2022.04.245
O. Mykhailov, M. V. Saveliev, R. L. Godun, V.V. Аvgustov
A brief overview of data of automated temperature monitoring systems at the periphery of nuclearly hazardous clusters of fuel-containing materials (FCM NHC) and analytical materials regarding the study of its dynamics at various monitoring points before and after installation of New Safe Confinement (NSC) into its design position, is presented. The characterization of revealed dominant trends in temperature time characteristics underway in the observation period from 1991 to 2015 and the reasons influencing their formation at various distances from FCM NHC boundaries in room 305/2, are addressed. The importance of the work of an expert research system (ERS), which functionally supplemented the existing nuclear safety monitoring system (NSMS) of CHNPP "Shelter" Object (SO) installed instead of decommissioned information and measuring system (IMS "Finish") and other autonomous FCM monitoring systems, is highlighted. A critical analysis of the state of current temperature monitoring around the FCM clusters is provided, and a conclusion about the need to improve the existing monitoring network is made.
{"title":"Long-term temperature dynamics at the peripherals on nuclearly hazardous clusters of fuel-containing materials located in room 305/2 of the \"Shelter\" object before and after new safe confinement installation into a design position","authors":"O. Mykhailov, M. V. Saveliev, R. L. Godun, V.V. Аvgustov","doi":"10.15407/jnpae2022.04.245","DOIUrl":"https://doi.org/10.15407/jnpae2022.04.245","url":null,"abstract":"A brief overview of data of automated temperature monitoring systems at the periphery of nuclearly hazardous clusters of fuel-containing materials (FCM NHC) and analytical materials regarding the study of its dynamics at various monitoring points before and after installation of New Safe Confinement (NSC) into its design position, is presented. The characterization of revealed dominant trends in temperature time characteristics underway in the observation period from 1991 to 2015 and the reasons influencing their formation at various distances from FCM NHC boundaries in room 305/2, are addressed. The importance of the work of an expert research system (ERS), which functionally supplemented the existing nuclear safety monitoring system (NSMS) of CHNPP \"Shelter\" Object (SO) installed instead of decommissioned information and measuring system (IMS \"Finish\") and other autonomous FCM monitoring systems, is highlighted. A critical analysis of the state of current temperature monitoring around the FCM clusters is provided, and a conclusion about the need to improve the existing monitoring network is made.","PeriodicalId":42588,"journal":{"name":"Nuclear Physics and Atomic Energy","volume":"45 1","pages":""},"PeriodicalIF":0.3,"publicationDate":"2022-12-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85342281","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-12-25DOI: 10.15407/jnpae2022.04.263
A. Lypska, V. Nikolaev, V. A. Shytiuk, O. Burdo, D. Vyshnevskyi
The results of radioecological monitoring of the research sites located on the drained areas and the coastal of the ChNPP cooling pond are presented. The features of the spatial distribution of the exposure dose rate, the density of soil radionuclide contamination by the emergency radionuclides were determined. The content of incorporated radionuclides in representatives of the genera Myodes and Sylvaemus were studied, the individual and interspecies variability of 137Cs and 90Sr levels in animals within the limits of one research site was determined. Currently, the indicators of radioactive contamination of biota in the drained areas of the cooling pond are within the variation of those values that are characteristic of most areas of the Chornobyl exclusion zone.
{"title":"Radioecological studies on the drained bed areas of the Chornobyl nuclear power plant cooling pond","authors":"A. Lypska, V. Nikolaev, V. A. Shytiuk, O. Burdo, D. Vyshnevskyi","doi":"10.15407/jnpae2022.04.263","DOIUrl":"https://doi.org/10.15407/jnpae2022.04.263","url":null,"abstract":"The results of radioecological monitoring of the research sites located on the drained areas and the coastal of the ChNPP cooling pond are presented. The features of the spatial distribution of the exposure dose rate, the density of soil radionuclide contamination by the emergency radionuclides were determined. The content of incorporated radionuclides in representatives of the genera Myodes and Sylvaemus were studied, the individual and interspecies variability of 137Cs and 90Sr levels in animals within the limits of one research site was determined. Currently, the indicators of radioactive contamination of biota in the drained areas of the cooling pond are within the variation of those values that are characteristic of most areas of the Chornobyl exclusion zone.","PeriodicalId":42588,"journal":{"name":"Nuclear Physics and Atomic Energy","volume":"49 1","pages":""},"PeriodicalIF":0.3,"publicationDate":"2022-12-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77030331","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-12-25DOI: 10.15407/jnpae2022.04.234
Y. Lobach, Sergiy Y. Lobach, E. Luferenko, V. M. Shevel
The WWR-M is a light-water-cooled and moderated heterogeneous research reactor with a thermal output of 10 MW. The final decommissioning planning is in progress now. The general decommissioning strategy consists of the dismantling and separate removal of the bulky elements as a whole (in one piece) without preliminary segmentation. The dismantling of the primary and secondary cooling loops is considered as one of the key tasks; a separate dismantling design has been developed. The baseline principles for the technical solution and safety are presented in the given paper. Results of the dose assessment showed that the work can be performed at a collective dose of less than 20 man-mSv.
{"title":"Assessment of the dose load during the dismantling of the WWR-M reactor","authors":"Y. Lobach, Sergiy Y. Lobach, E. Luferenko, V. M. Shevel","doi":"10.15407/jnpae2022.04.234","DOIUrl":"https://doi.org/10.15407/jnpae2022.04.234","url":null,"abstract":"The WWR-M is a light-water-cooled and moderated heterogeneous research reactor with a thermal output of 10 MW. The final decommissioning planning is in progress now. The general decommissioning strategy consists of the dismantling and separate removal of the bulky elements as a whole (in one piece) without preliminary segmentation. The dismantling of the primary and secondary cooling loops is considered as one of the key tasks; a separate dismantling design has been developed. The baseline principles for the technical solution and safety are presented in the given paper. Results of the dose assessment showed that the work can be performed at a collective dose of less than 20 man-mSv.","PeriodicalId":42588,"journal":{"name":"Nuclear Physics and Atomic Energy","volume":"231 1","pages":""},"PeriodicalIF":0.3,"publicationDate":"2022-12-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76109027","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-12-25DOI: 10.15407/jnpae2022.04.223
V. Abrosimov
Excitation of monopole pairing vibrations in superfluid nuclei in the two-neutron transfer reaction is studied within a kinetic model based on the semiclassical time-dependent Hartree - Fock - Bogolyubov theory. Using the anomalous (correlated) density response function, the monopole pairing mode and the amplitude of the dynamic variation of the pairing gap associated with this mode are obtained. It is shown that the pairing correlations give a coherent contribution to the spectroscopic factor for the excitation of monopole pairing vibrations in the two-neutron transfer reaction in superfluid nuclei. The contribution is determined by the distribution of neutron levels near the Fermi energy and does not exceed a few percent of the spectroscopic factor for the transfer of two neutrons to the ground state. This estimate is in agreement with experimental data for the ratio of the cross-section for excitation of the 0+-state in the (p, t)-reaction in the energy region of the monopole pairing mode, which is equal to the double pairing gap, to the cross section for excitation of the ground state in superfluid nuclei.
{"title":"Excitation of pairing vibrations in superfluid nuclei","authors":"V. Abrosimov","doi":"10.15407/jnpae2022.04.223","DOIUrl":"https://doi.org/10.15407/jnpae2022.04.223","url":null,"abstract":"Excitation of monopole pairing vibrations in superfluid nuclei in the two-neutron transfer reaction is studied within a kinetic model based on the semiclassical time-dependent Hartree - Fock - Bogolyubov theory. Using the anomalous (correlated) density response function, the monopole pairing mode and the amplitude of the dynamic variation of the pairing gap associated with this mode are obtained. It is shown that the pairing correlations give a coherent contribution to the spectroscopic factor for the excitation of monopole pairing vibrations in the two-neutron transfer reaction in superfluid nuclei. The contribution is determined by the distribution of neutron levels near the Fermi energy and does not exceed a few percent of the spectroscopic factor for the transfer of two neutrons to the ground state. This estimate is in agreement with experimental data for the ratio of the cross-section for excitation of the 0+-state in the (p, t)-reaction in the energy region of the monopole pairing mode, which is equal to the double pairing gap, to the cross section for excitation of the ground state in superfluid nuclei.","PeriodicalId":42588,"journal":{"name":"Nuclear Physics and Atomic Energy","volume":"39 1","pages":""},"PeriodicalIF":0.3,"publicationDate":"2022-12-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86168136","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-12-25DOI: 10.15407/jnpae2022.04.230
M. Dolinska, N. Doroshko, O. Dolinskyy
In the frame of the FAIR project, the Collector Ring (CR) is planned to be built for efficient cooling of antiprotons and rare isotope beams [1]. In order to accept hot beam from separators large acceptances are required. This paper examines the effects which can influence the beam dynamics due to large betatron oscillation amplitude and momentum spread. Using analytic expressions, the amplitude-dependent tune shifts driven by sextupole magnets, the fringe field of quadrupole magnets, and kinematics effects have been calculated. The obtained results have been compared with numerical simulations by means of precise multi-turn particle tracing. The tracking analysis for the CR has been performed considering the real shape of the magnetic field of the wide aperture quadrupole. We report on quantitative studies of the effects on the dynamic aperture of the rings.
{"title":"Nonlinear field effects in the collector ring due to large-amplitude particle oscillations","authors":"M. Dolinska, N. Doroshko, O. Dolinskyy","doi":"10.15407/jnpae2022.04.230","DOIUrl":"https://doi.org/10.15407/jnpae2022.04.230","url":null,"abstract":"In the frame of the FAIR project, the Collector Ring (CR) is planned to be built for efficient cooling of antiprotons and rare isotope beams [1]. In order to accept hot beam from separators large acceptances are required. This paper examines the effects which can influence the beam dynamics due to large betatron oscillation amplitude and momentum spread. Using analytic expressions, the amplitude-dependent tune shifts driven by sextupole magnets, the fringe field of quadrupole magnets, and kinematics effects have been calculated. The obtained results have been compared with numerical simulations by means of precise multi-turn particle tracing. The tracking analysis for the CR has been performed considering the real shape of the magnetic field of the wide aperture quadrupole. We report on quantitative studies of the effects on the dynamic aperture of the rings.","PeriodicalId":42588,"journal":{"name":"Nuclear Physics and Atomic Energy","volume":"28 1","pages":""},"PeriodicalIF":0.3,"publicationDate":"2022-12-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86764500","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-12-25DOI: 10.15407/jnpae2022.04.271
B. Zanoz, D. O. Bugai, D. Koliabina, R. Avila
Radioactive and chemical contamination of groundwater and surface water (Konoplyanka and Dnipro Rivers) in the zone of influence of the soviet era uranium production legacy site - Prydniprovsky Chemical Plant (PChP, Kamianske) is a source of radiological and toxicological risks for the population. Modeled water use scenarios included drinking water consumption, crop irrigation, fishing, and usage of the river beaches for recreation. According to the assessment results, the radiological risks of water usage in current conditions are low. At the same time, a conservative assessment indicates potential future toxicological risks from uranium (use of groundwater for drinking) and from manganese (due to accumulation in river fish). In the long term, risks from groundwater may increase significantly due to the dispersion of contaminated groundwater plumes outside the industrial site, or due to unrestricted access of the population to the territory of the PChP. To reduce uncertainty in the risk assessment results, it is important to improve the groundwater monitoring network downstream from the PChP site and to collect site-specific data on manganese transfer coefficients to fish.
{"title":"Assessments of radiological and toxicological risks from the use of groundwater and surface water in the zone of influence of the uranium production legacy site","authors":"B. Zanoz, D. O. Bugai, D. Koliabina, R. Avila","doi":"10.15407/jnpae2022.04.271","DOIUrl":"https://doi.org/10.15407/jnpae2022.04.271","url":null,"abstract":"Radioactive and chemical contamination of groundwater and surface water (Konoplyanka and Dnipro Rivers) in the zone of influence of the soviet era uranium production legacy site - Prydniprovsky Chemical Plant (PChP, Kamianske) is a source of radiological and toxicological risks for the population. Modeled water use scenarios included drinking water consumption, crop irrigation, fishing, and usage of the river beaches for recreation. According to the assessment results, the radiological risks of water usage in current conditions are low. At the same time, a conservative assessment indicates potential future toxicological risks from uranium (use of groundwater for drinking) and from manganese (due to accumulation in river fish). In the long term, risks from groundwater may increase significantly due to the dispersion of contaminated groundwater plumes outside the industrial site, or due to unrestricted access of the population to the territory of the PChP. To reduce uncertainty in the risk assessment results, it is important to improve the groundwater monitoring network downstream from the PChP site and to collect site-specific data on manganese transfer coefficients to fish.","PeriodicalId":42588,"journal":{"name":"Nuclear Physics and Atomic Energy","volume":"79 1","pages":""},"PeriodicalIF":0.3,"publicationDate":"2022-12-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86522834","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-12-25DOI: 10.15407/jnpae2022.04.280
M. A. El-Sarraf, A. El-Sayed Abdo
In this work, four waste paper composites were studied in terms of several photon interaction parameters over the energy region from 0.015 to 15.0 MeV. The waste paper and natural rubber (WP/NR) composites of different densities ranging from ρ = 0.894 to 1.16 gm⋅cm-3 were used for shielding radioactive rubble at different time period stages. Some additives were also used including high-abrasion furnace black, paraffin wax, B4C, as well as magnetite. The deduced parameters of photon interaction: equivalent atomic number Zeq, exposure buildup factor and energy absorption buildup factor have been studied as a function of incident photon energy, WP/NR elemental composition, and for penetration depths, up to 40 mean free path. The Zeq numbers have shown slight variation over the selected incident energy range and buildup factors were found to be modest at low and high photon energy meanwhile their values increase widely over the intermediate energy region. In addition, kerma relative to air for photon energies from 1 to 20 MeV were computed and show dependence upon equivalent atomic numbers. In this work, it was clear that filled samples offer better shielding capabilities than unfilled ones. The obtained data could be useful for radiation physicists and scientists in estimating the γ-irradiation received after applying such shields.
{"title":"Evaluation of gamma-ray buildup factors for some waste paper and natural rubber composites","authors":"M. A. El-Sarraf, A. El-Sayed Abdo","doi":"10.15407/jnpae2022.04.280","DOIUrl":"https://doi.org/10.15407/jnpae2022.04.280","url":null,"abstract":"In this work, four waste paper composites were studied in terms of several photon interaction parameters over the energy region from 0.015 to 15.0 MeV. The waste paper and natural rubber (WP/NR) composites of different densities ranging from ρ = 0.894 to 1.16 gm⋅cm-3 were used for shielding radioactive rubble at different time period stages. Some additives were also used including high-abrasion furnace black, paraffin wax, B4C, as well as magnetite. The deduced parameters of photon interaction: equivalent atomic number Zeq, exposure buildup factor and energy absorption buildup factor have been studied as a function of incident photon energy, WP/NR elemental composition, and for penetration depths, up to 40 mean free path. The Zeq numbers have shown slight variation over the selected incident energy range and buildup factors were found to be modest at low and high photon energy meanwhile their values increase widely over the intermediate energy region. In addition, kerma relative to air for photon energies from 1 to 20 MeV were computed and show dependence upon equivalent atomic numbers. In this work, it was clear that filled samples offer better shielding capabilities than unfilled ones. The obtained data could be useful for radiation physicists and scientists in estimating the γ-irradiation received after applying such shields.","PeriodicalId":42588,"journal":{"name":"Nuclear Physics and Atomic Energy","volume":"167 1","pages":""},"PeriodicalIF":0.3,"publicationDate":"2022-12-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75472812","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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