Pub Date : 2022-10-27DOI: 10.15407/jnpae2023.01.005
S. V. Lukyanov
Using the methods of kinetic theory, expressions for the diffusion and drift coefficients for a cold Fermi system are obtained. Their dependencies on the momentum are calculated for the step distribution function as well as in the case of excitation of a particle-hole pair.
{"title":"Properties of the diffusion and drift kinetic coefficients in momentum space for a cold Fermi system","authors":"S. V. Lukyanov","doi":"10.15407/jnpae2023.01.005","DOIUrl":"https://doi.org/10.15407/jnpae2023.01.005","url":null,"abstract":"Using the methods of kinetic theory, expressions for the diffusion and drift coefficients for a cold Fermi system are obtained. Their dependencies on the momentum are calculated for the step distribution function as well as in the case of excitation of a particle-hole pair.","PeriodicalId":42588,"journal":{"name":"Nuclear Physics and Atomic Energy","volume":"1 1","pages":""},"PeriodicalIF":0.3,"publicationDate":"2022-10-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80861461","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 : 2022-09-25DOI: 10.15407/jnpae2022.03.164
S. Mezhevych, A. Rudchik, O. Ponkratenko, K. Rusek, K. Kemper, V.M. Kyrianchuk, A. A. Rudchik, Y. Stepanenko, V. Uleshchenko
A comparative analysis of calculations for the 12С(10В,10В)12С elastic scattering at Еlab(10B) = 41.3 MeV, the 12С(11В,11В)12С elastic scattering at Еlab(11B) = 40.0 MeV, transfer reactions 13С(11В,12С)12В and 14С(11В,12С)13В at Еlab(11B) = 45.0 МеВ was performed within the coupled-reaction-channels method (CRC) using previously deduced Woods-Saxon potentials for the interaction of 10,11,12,13В + 12С nuclei in the exit reaction channels, as well as potentials for these systems of nuclei generated by means of the double-folding method using theoretically modeled shapes for the distributions of protons and neutrons in 10,11,12,13В and 12С. The relationship of isotopic effects (differences of the calculated CRC cross sections when replacing the potential for a given pair of nuclei by interaction potential for one nucleus with the isotope of another nucleus) with the internal structure, e.g. the shapes of nucleon density distributions in the interacting nuclei, is investigated. The shapes (radial dependence) of recently deduced Woods-Saxon potentials and potentials calculated by means of the double-folding methods for the systems of 10,11,12,13В + 12С nuclei are compared. Based on the results of the analysis of experimental data, an assumption is made about the possible differences in the shapes of surface nucleon density distributions from the ones modeled theoretically in 10,11B isotopes.
比较分析计算的12个С(10В10В)12С弹性散射Е实验室(10 b) = 41.3兆电子伏,12个С(11ВВ11日)12С弹性散射Е实验室(11 b) = 40.0兆电子伏,转移反应13С(11В12С)12В和14С(11В12С)13ВЕ实验室(11 b) = 45.0МеВcoupled-reaction-channels内执行方法(CRC)使用之前推断Woods-Saxon潜力10的交互,11日12日13日В+ 12С原子核在反应退出渠道,以及利用理论模拟的质子和中子在10、11、12、13В和12С的分布的形状，用双折叠方法产生的这些核系统的势。研究了同位素效应(用一个原子核与另一个原子核的同位素相互作用势代替一对给定原子核的势时计算出的CRC截面的差异)与内部结构(如相互作用原子核中核子密度分布的形状)的关系。比较了10、11、12、13В + 12С核系最近推导的Woods-Saxon势和用双折叠方法计算的势的形状(径向依赖)。根据实验数据的分析结果，对10、11B同位素表面核子密度分布的形状与理论模型可能存在的差异作了假设。
{"title":"Potentials of interaction of 10,11,12,13B isotopes with 12C","authors":"S. Mezhevych, A. Rudchik, O. Ponkratenko, K. Rusek, K. Kemper, V.M. Kyrianchuk, A. A. Rudchik, Y. Stepanenko, V. Uleshchenko","doi":"10.15407/jnpae2022.03.164","DOIUrl":"https://doi.org/10.15407/jnpae2022.03.164","url":null,"abstract":"A comparative analysis of calculations for the 12С(10В,10В)12С elastic scattering at Еlab(10B) = 41.3 MeV, the 12С(11В,11В)12С elastic scattering at Еlab(11B) = 40.0 MeV, transfer reactions 13С(11В,12С)12В and 14С(11В,12С)13В at Еlab(11B) = 45.0 МеВ was performed within the coupled-reaction-channels method (CRC) using previously deduced Woods-Saxon potentials for the interaction of 10,11,12,13В + 12С nuclei in the exit reaction channels, as well as potentials for these systems of nuclei generated by means of the double-folding method using theoretically modeled shapes for the distributions of protons and neutrons in 10,11,12,13В and 12С. The relationship of isotopic effects (differences of the calculated CRC cross sections when replacing the potential for a given pair of nuclei by interaction potential for one nucleus with the isotope of another nucleus) with the internal structure, e.g. the shapes of nucleon density distributions in the interacting nuclei, is investigated. The shapes (radial dependence) of recently deduced Woods-Saxon potentials and potentials calculated by means of the double-folding methods for the systems of 10,11,12,13В + 12С nuclei are compared. Based on the results of the analysis of experimental data, an assumption is made about the possible differences in the shapes of surface nucleon density distributions from the ones modeled theoretically in 10,11B isotopes.","PeriodicalId":42588,"journal":{"name":"Nuclear Physics and Atomic Energy","volume":"96 1","pages":""},"PeriodicalIF":0.3,"publicationDate":"2022-09-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79183059","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 : 2022-09-25DOI: 10.15407/jnpae2022.03.153
A. Rudchik, A. A. Rudchik, V.V. Khejlo, K. Rusek, K. Kemper, E. Piasecki, A. Stolarz, A. Trzcińska, Val. M. Pirnak, O. Ponkratenko, E. I. Koshchy, O. E. Kutsyk, S. Mezhevych, A. P. Ilyin, Y. Stepanenko, V. Uleshchenko, Yu. O. Shyrma
New experimental data of angular distributions for the elastic and inelastic scattering of 15N ions by 10B nuclei were obtained at the energy Elab(15N) = 81 MeV. The experimental data were analyzed within the coupled-reaction channels method (CRC). The Woods - Saxon optical potentials were used for nuclei interactions in the calculations. The potential's parameters for the interaction of 15N + 10В nuclei were deduced as well as it was measured the angular distribution of the elastic scattering for these nuclei. The experimental data of the 15N + 10В elastic scattering are compared with data of the 15N + 11В and 14N + 10В scatterings. It was discovered isotopic effects in the scatterings of these three nuclear couples due to the difference in the optical potentials of the interaction of these nuclei and their structure. New experimental data of inelastic scattering of 15N + 10В nuclei for 0.718 - 3.587 МеV states of 10В nucleus and for 5.270 - 6.324 МеV states of 15N nucleus were measured. These data were analyzed within the CRC method using the translation-invariant shell model for collective excitations of 15N and 10B nuclei. Information about deformations of these nuclei was obtained.
{"title":"Elastic and inelastic scattering of 15N ions by 10B at energy 81 MeV. Isotopic effects in scattering of 15N + 10В, 15N + 11В, 14N + 10В nuclei","authors":"A. Rudchik, A. A. Rudchik, V.V. Khejlo, K. Rusek, K. Kemper, E. Piasecki, A. Stolarz, A. Trzcińska, Val. M. Pirnak, O. Ponkratenko, E. I. Koshchy, O. E. Kutsyk, S. Mezhevych, A. P. Ilyin, Y. Stepanenko, V. Uleshchenko, Yu. O. Shyrma","doi":"10.15407/jnpae2022.03.153","DOIUrl":"https://doi.org/10.15407/jnpae2022.03.153","url":null,"abstract":"New experimental data of angular distributions for the elastic and inelastic scattering of 15N ions by 10B nuclei were obtained at the energy Elab(15N) = 81 MeV. The experimental data were analyzed within the coupled-reaction channels method (CRC). The Woods - Saxon optical potentials were used for nuclei interactions in the calculations. The potential's parameters for the interaction of 15N + 10В nuclei were deduced as well as it was measured the angular distribution of the elastic scattering for these nuclei. The experimental data of the 15N + 10В elastic scattering are compared with data of the 15N + 11В and 14N + 10В scatterings. It was discovered isotopic effects in the scatterings of these three nuclear couples due to the difference in the optical potentials of the interaction of these nuclei and their structure. New experimental data of inelastic scattering of 15N + 10В nuclei for 0.718 - 3.587 МеV states of 10В nucleus and for 5.270 - 6.324 МеV states of 15N nucleus were measured. These data were analyzed within the CRC method using the translation-invariant shell model for collective excitations of 15N and 10B nuclei. Information about deformations of these nuclei was obtained.","PeriodicalId":42588,"journal":{"name":"Nuclear Physics and Atomic Energy","volume":"21 1","pages":""},"PeriodicalIF":0.3,"publicationDate":"2022-09-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90397609","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 : 2022-09-25DOI: 10.15407/jnpae2022.03.207
V. O. Zheltonozhskyi, D. E. Myznikov, A. M. Savrasov, V. I. Slisenko
The γ-spectra were measured of the structural materials of the 2nd unit of the Chornobyl NPP which were irradiated by bremsstrahlung with end-point energy 37 MeV. Using the ratio of the 57Co and 58Co activities, the nickel and cobalt masses ratio was determined. Using the obtained data and the measured 60Co activity in the studied samples, a method for determining of the 63Ni activity was developed. Radiochemical validation of the created method was performed and good quantitative agreement of 63Ni activities obtained by spectroscopic and radiochemical methods was obtained.
{"title":"Determination of 63Ni activity in NPP construction materials","authors":"V. O. Zheltonozhskyi, D. E. Myznikov, A. M. Savrasov, V. I. Slisenko","doi":"10.15407/jnpae2022.03.207","DOIUrl":"https://doi.org/10.15407/jnpae2022.03.207","url":null,"abstract":"The γ-spectra were measured of the structural materials of the 2nd unit of the Chornobyl NPP which were irradiated by bremsstrahlung with end-point energy 37 MeV. Using the ratio of the 57Co and 58Co activities, the nickel and cobalt masses ratio was determined. Using the obtained data and the measured 60Co activity in the studied samples, a method for determining of the 63Ni activity was developed. Radiochemical validation of the created method was performed and good quantitative agreement of 63Ni activities obtained by spectroscopic and radiochemical methods was obtained.","PeriodicalId":42588,"journal":{"name":"Nuclear Physics and Atomic Energy","volume":"29 1","pages":""},"PeriodicalIF":0.3,"publicationDate":"2022-09-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73252014","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 : 2022-09-25DOI: 10.15407/jnpae2022.03.172
M. V. Saveliev, R. L. Godun, M. Pantin, I. Skiter, K. Sushchenko
The paper presents a brief description of the Nuclear Safety Monitoring System (NSMS), which is a part of the Integrated Automated Monitoring System of the "Shelter" object (a facility that covers the destroyed Unit No. 4 of the Chornobyl NPP). Further development of the NSMS is proposed by introducing algorithms for automatic identification of neutron anomalies with a help of fuzzy logic and statistical methods; digital filtering of specific irregular impulse interferences leading to metrological system failures; algorithms for predicting changes in neutron flux density and assessing changes in the nuclear hazard of fuel containing materials accumulations.
{"title":"The nuclear safety monitoring system for fuel-containing materials located in destroyed unit No. 4 of the Chornobyl NPP and proposals for its modernization","authors":"M. V. Saveliev, R. L. Godun, M. Pantin, I. Skiter, K. Sushchenko","doi":"10.15407/jnpae2022.03.172","DOIUrl":"https://doi.org/10.15407/jnpae2022.03.172","url":null,"abstract":"The paper presents a brief description of the Nuclear Safety Monitoring System (NSMS), which is a part of the Integrated Automated Monitoring System of the \"Shelter\" object (a facility that covers the destroyed Unit No. 4 of the Chornobyl NPP). Further development of the NSMS is proposed by introducing algorithms for automatic identification of neutron anomalies with a help of fuzzy logic and statistical methods; digital filtering of specific irregular impulse interferences leading to metrological system failures; algorithms for predicting changes in neutron flux density and assessing changes in the nuclear hazard of fuel containing materials accumulations.","PeriodicalId":42588,"journal":{"name":"Nuclear Physics and Atomic Energy","volume":"41 1","pages":""},"PeriodicalIF":0.3,"publicationDate":"2022-09-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74081841","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 : 2022-09-25DOI: 10.15407/jnpae2022.03.182
V. Kashparov, D. Holiaka, S. Levchuk, V. Berkovskyy
The radiological zoning of Chornobyl contaminated areas was one of the essential elements of social and radiation protection. The zoning was based on estimates of annual committed effective doses to members of the public and on the levels of radionuclide deposition density. In 1991, 86 settlements were classified as associated with the zone of unconditional (mandatory) resettlement, and 841 settlements were assigned to the zone of guaranteed voluntary resettlement. The status of these settlements has been preserved until now. The assessments showed that as of 2022, for all settlements located outside the Chornobyl Exclusion Zone the radiological conditions do not exceed the current legislative criteria for inclusion in the zone of unconditional (mandatory) resettlement. It is also shown that in 2022, the zone of guaranteed voluntary resettlement can be assigned for: only 38 settlements, according to the legislative criterion "90Sr density of contamination" and only 17 settlements, according to the legislative criterion "137Cs density of contamination". The work also indicates and analyses the provisions of current legislation that require clarification.
{"title":"Zoning of radioactively contaminated territories after the Chornobyl accident","authors":"V. Kashparov, D. Holiaka, S. Levchuk, V. Berkovskyy","doi":"10.15407/jnpae2022.03.182","DOIUrl":"https://doi.org/10.15407/jnpae2022.03.182","url":null,"abstract":"The radiological zoning of Chornobyl contaminated areas was one of the essential elements of social and radiation protection. The zoning was based on estimates of annual committed effective doses to members of the public and on the levels of radionuclide deposition density. In 1991, 86 settlements were classified as associated with the zone of unconditional (mandatory) resettlement, and 841 settlements were assigned to the zone of guaranteed voluntary resettlement. The status of these settlements has been preserved until now. The assessments showed that as of 2022, for all settlements located outside the Chornobyl Exclusion Zone the radiological conditions do not exceed the current legislative criteria for inclusion in the zone of unconditional (mandatory) resettlement. It is also shown that in 2022, the zone of guaranteed voluntary resettlement can be assigned for: only 38 settlements, according to the legislative criterion \"90Sr density of contamination\" and only 17 settlements, according to the legislative criterion \"137Cs density of contamination\". The work also indicates and analyses the provisions of current legislation that require clarification.","PeriodicalId":42588,"journal":{"name":"Nuclear Physics and Atomic Energy","volume":"48 1","pages":""},"PeriodicalIF":0.3,"publicationDate":"2022-09-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89228776","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 : 2022-09-25DOI: 10.15407/jnpae2022.03.195
L. Romanchuck, V. Ustymenko
Among the most pressing threats to the existence of forest plant complexes of the nature reserve fund is the pyrogenic danger, which is exacerbated by changes in the natural hydrolytic regime and global climate change, the driving effects of which are currently difficult to fully assess. The article highlights the results of a study of the forest plant complexes and soil state of the nature reserve "Drevlyanskyi" in Zhytomyr region after the fires. The results of the field survey of plantations, agrochemical and radiological analysis of soil indicators are presented. Studies show a change in the composition of forest plant complexes, a reduction in the number of herbaceous species, and a decrease in the area of moss and lichen cover. The surveyed area is characterized by significant spatial heterogeneity of the main agrochemical and physicochemical parameters of the soil. There was a slight increase in the content of heavy metals in the soil, however, the indicators did not exceed the maximum allowable concentrations in these areas. To assess the radiation situation after fires on the territory of the nature reserve, the indicators of the density of soil pollution with 137Cs and 90Sr were determined. The authors recommended a set of measures to improve the efficiency of nature reserves. Adherence to the recommendations will help to increase the environmental sustainability of forest plant complexes and will minimize the occurrence of fires and their consequences.
{"title":"Effect of forest fires on forest plant complexes contaminated by radionuclides","authors":"L. Romanchuck, V. Ustymenko","doi":"10.15407/jnpae2022.03.195","DOIUrl":"https://doi.org/10.15407/jnpae2022.03.195","url":null,"abstract":"Among the most pressing threats to the existence of forest plant complexes of the nature reserve fund is the pyrogenic danger, which is exacerbated by changes in the natural hydrolytic regime and global climate change, the driving effects of which are currently difficult to fully assess. The article highlights the results of a study of the forest plant complexes and soil state of the nature reserve \"Drevlyanskyi\" in Zhytomyr region after the fires. The results of the field survey of plantations, agrochemical and radiological analysis of soil indicators are presented. Studies show a change in the composition of forest plant complexes, a reduction in the number of herbaceous species, and a decrease in the area of moss and lichen cover. The surveyed area is characterized by significant spatial heterogeneity of the main agrochemical and physicochemical parameters of the soil. There was a slight increase in the content of heavy metals in the soil, however, the indicators did not exceed the maximum allowable concentrations in these areas. To assess the radiation situation after fires on the territory of the nature reserve, the indicators of the density of soil pollution with 137Cs and 90Sr were determined. The authors recommended a set of measures to improve the efficiency of nature reserves. Adherence to the recommendations will help to increase the environmental sustainability of forest plant complexes and will minimize the occurrence of fires and their consequences.","PeriodicalId":42588,"journal":{"name":"Nuclear Physics and Atomic Energy","volume":"23 1","pages":""},"PeriodicalIF":0.3,"publicationDate":"2022-09-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73675805","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 : 2022-09-25DOI: 10.15407/jnpae2022.03.159
O. Povoroznyk, O. K. Gorpinich
The new analysis of inclusive proton spectra from 3H(α,p)6He reaction was performed. The existence of two new excited levels of 6He with energy parameters E2ex.s.*= 2.4 MeV, Γ = 0.4 MeV; E3ex.s.*= 3.0 MeV, Γ = 0.6 MeV was confirmed as a result of new parameterization performed using energy parameters obtained from the correlation kinematic-incomplete experimental study of 3H(α,pα)nn reactions at Eα = 27.2 MeV and Eα = 67.2 MeV in contrast to the initial analysis, in which the resonance observed above the known first excited 6He level E1ex.s. = 1.8 MeV was treated as the second broad excited level E2ex.s. = 2.98 (0.17) MeV, Γ2ex.s. = 2.39 (0.27) MeV.
{"title":"Improved parametrization of inclusive proton spectra from 3H(α,p)6He reaction using data obtained in a correlation experiment","authors":"O. Povoroznyk, O. K. Gorpinich","doi":"10.15407/jnpae2022.03.159","DOIUrl":"https://doi.org/10.15407/jnpae2022.03.159","url":null,"abstract":"The new analysis of inclusive proton spectra from 3H(α,p)6He reaction was performed. The existence of two new excited levels of 6He with energy parameters E2ex.s.*= 2.4 MeV, Γ = 0.4 MeV; E3ex.s.*= 3.0 MeV, Γ = 0.6 MeV was confirmed as a result of new parameterization performed using energy parameters obtained from the correlation kinematic-incomplete experimental study of 3H(α,pα)nn reactions at Eα = 27.2 MeV and Eα = 67.2 MeV in contrast to the initial analysis, in which the resonance observed above the known first excited 6He level E1ex.s. = 1.8 MeV was treated as the second broad excited level E2ex.s. = 2.98 (0.17) MeV, Γ2ex.s. = 2.39 (0.27) MeV.","PeriodicalId":42588,"journal":{"name":"Nuclear Physics and Atomic Energy","volume":"75 1","pages":""},"PeriodicalIF":0.3,"publicationDate":"2022-09-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83362418","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 : 2022-09-25DOI: 10.15407/jnpae2022.03.212
P. Zhmurin, D.A. Yelisieiev, V. Alekseev, O.V. Yelisieieva, Yu.О. Нurkalenko
One of the problems in creating a radiation-hard scintillation composition on a polysiloxane base is the search for a radiation-hard activator capable of dissolving in such a base in sufficient quantity. In this work, in order to improve the solubility of p-terphenyl molecules in a polysiloxane base, its structure was modified with tert-butyl substituents. The obtained alkyl derivative of p-terphenyl was used as an activator of polysiloxane-based scintillators. The optical and scintillation properties of the obtained polysiloxane-based scintillators were studied, and their radiation hardness was determined.
{"title":"Alkyl derivative of p-terphenyl as an activator of polysiloxane-based scintillator","authors":"P. Zhmurin, D.A. Yelisieiev, V. Alekseev, O.V. Yelisieieva, Yu.О. Нurkalenko","doi":"10.15407/jnpae2022.03.212","DOIUrl":"https://doi.org/10.15407/jnpae2022.03.212","url":null,"abstract":"One of the problems in creating a radiation-hard scintillation composition on a polysiloxane base is the search for a radiation-hard activator capable of dissolving in such a base in sufficient quantity. In this work, in order to improve the solubility of p-terphenyl molecules in a polysiloxane base, its structure was modified with tert-butyl substituents. The obtained alkyl derivative of p-terphenyl was used as an activator of polysiloxane-based scintillators. The optical and scintillation properties of the obtained polysiloxane-based scintillators were studied, and their radiation hardness was determined.","PeriodicalId":42588,"journal":{"name":"Nuclear Physics and Atomic Energy","volume":"404 1","pages":""},"PeriodicalIF":0.3,"publicationDate":"2022-09-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87100745","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 : 2022-06-25DOI: 10.15407/jnpae2022.02.107
Y. Lobach, Sergiy Y. Lobach, V. M. Shevel
Following the demands established by the current Ukrainian legislation, the Decommissioning Concept for the WWR-M research reactor was recently approved. The Concept envisages a strategy of immediate dismantling; it identifies and justifies the main technical and organizational measures for the preparation and implementation of decommissioning, the sequence of planned works and activities, as well as the necessary conditions and infrastructure. Decommissioning requires proper planning and demonstration that all planned dismantling works will be carried out safely. Presented safety assessment is a mandatory component of the Concept and the most important element of the overarching technological scheme. The purpose of the safety analysis is to provide input for detailed planning on how to ensure safety during decommissioning. Based on the results of the safety analysis, the measures to ensure radiation protection are defined while justifying their necessity and sufficiency.
{"title":"Preliminary safety analysis at the decommissioning of the WWR-M research reactor","authors":"Y. Lobach, Sergiy Y. Lobach, V. M. Shevel","doi":"10.15407/jnpae2022.02.107","DOIUrl":"https://doi.org/10.15407/jnpae2022.02.107","url":null,"abstract":"Following the demands established by the current Ukrainian legislation, the Decommissioning Concept for the WWR-M research reactor was recently approved. The Concept envisages a strategy of immediate dismantling; it identifies and justifies the main technical and organizational measures for the preparation and implementation of decommissioning, the sequence of planned works and activities, as well as the necessary conditions and infrastructure. Decommissioning requires proper planning and demonstration that all planned dismantling works will be carried out safely. Presented safety assessment is a mandatory component of the Concept and the most important element of the overarching technological scheme. The purpose of the safety analysis is to provide input for detailed planning on how to ensure safety during decommissioning. Based on the results of the safety analysis, the measures to ensure radiation protection are defined while justifying their necessity and sufficiency.","PeriodicalId":42588,"journal":{"name":"Nuclear Physics and Atomic Energy","volume":"119 1","pages":""},"PeriodicalIF":0.3,"publicationDate":"2022-06-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81696904","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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