Nuclear Physics and Atomic Energy最新文献

{"title":"Representative and highly sensitive express method of measurement of f-activity","authors":"Y. Shchepkin, N. Mazina, V. I. Slisenko, D. Stratilat","doi":"10.15407/jnpae2022.02.140","DOIUrl":"https://doi.org/10.15407/jnpae2022.02.140","url":null,"abstract":"The method for determination of f-activity (spontaneous fission) of samples based on a combination of multiplicity spectrometry, measurement of radiation energy, and registration of time of long-range fission products is considered. The method is representative, highly sensitive, and fast. The minimum determined value of the specific activity is 1.4⋅10-3 Bq/g.","PeriodicalId":42588,"journal":{"name":"Nuclear Physics and Atomic Energy","volume":"116 1","pages":""},"PeriodicalIF":0.3,"publicationDate":"2022-06-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87715220","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}

{"title":"Degradation and recovery features of irradiated GAP LEDs","authors":"O. Budnyk, R. Vernydub, O. Kyrylenko, P. Lytovchenko, O. Radkevych, D. Stratilat, V. Tartachnyk","doi":"10.15407/jnpae2022.02.116","DOIUrl":"https://doi.org/10.15407/jnpae2022.02.116","url":null,"abstract":"The homo-transitional original and irradiated by electrons with E = 2 MeV; F = 5.9⋅1014 cm-2 ÷ 8.2⋅1016 cm-2 GaP LEDs were studied. The effect of radiation treatment on their electrical and optical characteristics was studied; the results of isochronous annealing of irradiated samples are given; the consequences of high-temperature annealing of output diodes are analyzed. Peculiarities of the formation of the current-voltage characteristics of red LEDs doped with Zn, O, and green LEDs doped with N under reverse bias, as well as features of the recovery of the reverse current during annealing of both types of LEDs, are revealed.","PeriodicalId":42588,"journal":{"name":"Nuclear Physics and Atomic Energy","volume":"14 1","pages":""},"PeriodicalIF":0.3,"publicationDate":"2022-06-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75791692","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}

{"title":"Effect of high energy electron exposure of the saline solution on physicochemical properties and cytotoxic activity of doxorubicin","authors":"M. A. Zabolotnyy, L. Aslamova, G. Dovbeshko, O. Gnatyuk, V. Neimash, V. Povarchuk, V. Orel, D. Kolesnyk, L. M. Kirkilevska, G.I. Solyanyk","doi":"10.15407/jnpae2022.02.131","DOIUrl":"https://doi.org/10.15407/jnpae2022.02.131","url":null,"abstract":"The effect of preliminary irradiation of an aqueous solution of sodium chloride (saline) with 1 MeV high-energy electron beams on optical and cytotoxic/cytostatic properties of the dissolved Doxorubicin cancer drug is studied. With the use of Lewis lung carcinoma cell culture, it has been shown that the said treatment results in an increased cytotoxic/cytostatic action of the Doxorubicin, being the most pronounced in the range of low concentrations of the drug. The delivered dose of ionizing radiation on the saline ranged from 4 to 80 kGy. The maximum changes in the IR absorption spectra of Doxorubicin have been observed for the solutions irradiated with 10 kGy. The possible causes of the observed effects are discussed.","PeriodicalId":42588,"journal":{"name":"Nuclear Physics and Atomic Energy","volume":"71 1","pages":""},"PeriodicalIF":0.3,"publicationDate":"2022-06-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83849818","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}

{"title":"Model of reactivity accident of the RBMK-1000 reactor","authors":"V. Borysenko, V. Goranchuk","doi":"10.15407/jnpae2022.02.099","DOIUrl":"https://doi.org/10.15407/jnpae2022.02.099","url":null,"abstract":"The reactor model was used to study the accident that destroyed the RBMK-1000 reactor at Unit 4 of the Chornobyl nuclear power plant on 26 April 1996. The model of reactivity accident of the RBMK-1000 reactor is based on equations of nuclear reactor kinetics, taking into account feedback in reactor reactivity. Reactivity changes as a result of both external influences – the movement of regulatory organs, changes in the reactor inlet coolant temperature, – and as a result of feedback by core parameters – changes in fuel temperature, coolant density, and 135Хе concentration. The model takes into account steam generation in the reactor core, which corresponds to the real physics of processes at the RBMK reactor, and allows obtaining simulation results that best match the recorded data and the consequences of the accident process. The study of reactivity accident on RBMK-1000 reactor is carried out for different combinations of values of control rods efficiency; reactivity coefficients by fuel temperature and coolant density; changes in the reactor inlet coolant temperature; the emergency protection time, as well as the reactor power level before closing the turbine generator stop valve. Different reactivity accident scenarios at RBMK-1000 reactor allow us to determine the most unfavorable combinations of external influences on the course of reactivity accident, namely: start time of main coolant pump rundown, time of activation of emergency protection, power level before the closing of turbine generator stop valves. In most reactivity accident scenarios, first of all, the critical values of fuel enthalpy are reached, at which the process of fuel destruction in the fuel element, destruction of the fuel assembly, and assembly channel start. Important results of studies are 1 – determination of the fact that time of activation of emergency protection after the closing of stop valves of turbine generator significantly affects the value of the maximum neutron power that is achieved during a reactivity accident; 2 – determination of the effect of reactor power before the closing of turbine generator stop valves on the course of the accident; 3 – it is not necessary to achieve supercritical on instantaneous neutrons, supercritical on delayed neutrons is enough to start fuel destruction.","PeriodicalId":42588,"journal":{"name":"Nuclear Physics and Atomic Energy","volume":"357 1","pages":""},"PeriodicalIF":0.3,"publicationDate":"2022-06-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82910724","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}

{"title":"Characteristics of the territory of the Rivne region according to the value of radon flux density out of the soil","authors":"M. Klymenko, O. Klymenko, O. Lebed, L. Klymenko, I.I. Zaleskiy, O.V. Varzhel","doi":"10.15407/jnpae2022.02.122","DOIUrl":"https://doi.org/10.15407/jnpae2022.02.122","url":null,"abstract":"This article presents features of pre-Mesozoic Quaternary sediments and soil variations for the territory of the region. Middle-Upper Riphean sediments (sandstones) of the Lower Vendus (tuffs, basalts), represent the Polissia zone on the territory. The Lisostep zone is represented by Devonian sediments (interlayers of argillites, siltstones, and limestones). The soils of the Polissia area formed the mellow sand and moraine deposits and represent the soddy podzolic of the different levels of soil gleying. The soils of Lisostep formed less and loamy soils and they represent mainly grey forest podzolic and low humus chernozem with the marks of soil podzolization. The scale of quantitative and qualitative estimation of constrained ecological risk for the region population is set from lower to a high level with the value of radon current density out of the soil from 0 to 25 mBq/(m2⋅s), medium – from 25.1 to 50 mBq/(m2⋅s), higher than medium from 50.1 to 75 mBq/(m2⋅s), higher than 75 mBq/(m2⋅s). Notably, in the Polissia area, 46.3 % of the population suffers from a medium level of risk and in the area of Lisostep, 23.4 % of the population suffers from higher than medium risk and 4.6 % suffers from high-constrained ecological risk.","PeriodicalId":42588,"journal":{"name":"Nuclear Physics and Atomic Energy","volume":"7 1","pages":""},"PeriodicalIF":0.3,"publicationDate":"2022-06-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81991973","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}

{"title":"Elastic and inelastic form factors of the 10B nuclei with the large-basis shell model","authors":"Bashair H. Jawed, A. D. Salman, S.M. Imran Hossain","doi":"10.15407/jnpae2022.02.093","DOIUrl":"https://doi.org/10.15407/jnpae2022.02.093","url":null,"abstract":"In this study, inelastic and elastic form factors for the low-lying excited states of 10B nucleus were calculated utilizing the nuclear shell model theory. We employed a large-basis psd model space with psdmwk interaction and the harmonic oscillator potential in the form factors calculation. The calculated results with the effective charge are in acceptable agreement with experimental results.","PeriodicalId":42588,"journal":{"name":"Nuclear Physics and Atomic Energy","volume":"39 1","pages":""},"PeriodicalIF":0.3,"publicationDate":"2022-06-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79107923","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}

{"title":"Assessment of the possibility of a return to the original use of pastures and hayfields abandoned after the Chornobyl accident","authors":"Y. Khomutinin, O. V. Kosarchuk, S. Polishchuk, M. Lazarev, S. Levchuk, V. V. Pavliuchenko","doi":"10.15407/jnpae2022.01.047","DOIUrl":"https://doi.org/10.15407/jnpae2022.01.047","url":null,"abstract":"A radiological assessment of hayfields and pastures (Narodychy district, Zhytomyr region), which were taken out of economic use due to contamination after the Chornobyl accident, was performed. The possibility and ways of returning the lands to original use were considered. Maps of 137Cs and 90Sr soil contamination densities for the field were made and the corresponding statistical characteristics of the contamination were estimated. Estimates of 137Cs and 90Sr activity concentration in natural grasses, cow milk, and meat as well as the risks of exceeding by the values the permissible levels have been calculated. The possibility of using the land for the production of milk and meat has been shown in the example of the considered radioactively contaminated pastures.","PeriodicalId":42588,"journal":{"name":"Nuclear Physics and Atomic Energy","volume":"35 1","pages":""},"PeriodicalIF":0.3,"publicationDate":"2022-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78771409","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}

{"title":"The uptake and excretion rate of 137Cs from the silver Prussian carp (Carassius gibelio) at different feeding routine","authors":"O. Kashparova, S. Levchuk, Y. Khomutinin, P. Pavlenko, M. Hrechaniuk, V. Kashparov","doi":"10.15407/jnpae2022.01.057","DOIUrl":"https://doi.org/10.15407/jnpae2022.01.057","url":null,"abstract":"Throughout 2016 - 2021, a series of experimental studies on 137Cs uptake and excretion rate constants for the silver Prussian carp (Carassius gibelio) were conducted in the Chornobyl exclusion zone (ChEZ) under natural conditions. To confirm the metabolic parameters of 137Cs in the silver Prussian carp under strictly controlled conditions at different feed amounts real supporting laboratory experiments have been conducted. The excretion rate of the 137Cs from the silver Prussian carp increased with increasing feed amount from 0.0068 ± 0.0003 day-1 to 0.0085 ± 0.0005 day-1 at water temperatures of 26 °C. The biological half-life of 137Cs activity concentration in fish can be reduced by 2 times by increasing fish growth using clean feeding. The excretion rate of the 137Cs from the silver Prussian carp agreed with data collected in natural conditions in the ChEZ during 2016 - 2020 at different water temperatures.","PeriodicalId":42588,"journal":{"name":"Nuclear Physics and Atomic Energy","volume":"91 1","pages":""},"PeriodicalIF":0.3,"publicationDate":"2022-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75166588","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}

{"title":"Effect of neutron irradiation on the structure and strength of the SAV-1 aluminum alloy","authors":"Sh. A. Alikulov, S. Baytelesov, F. Kungurov, D. P. Tadjibaev, D. Tojiboev","doi":"10.15407/jnpae2022.01.033","DOIUrl":"https://doi.org/10.15407/jnpae2022.01.033","url":null,"abstract":"The aluminum alloy SAV-1 was studied before and after inducing the radiation damage by means of neutrons with the following values of doses: 1016 - 1018 n/сm2. The measurements were carried out by neutron diffraction methods to analyze the correlation of the structural state with the results of measurements of the strength of the sample obtained using a loading machine. It was found that the changes in the strength characteristics of aluminum alloys were associated with modifications at the grain boundary during irradiation of the samples. Thus, the obtained experimental data allows us to conclude that the SAV-1 alloy represents an interstitial solid solution, and the strength of the alloy changes nonlinearly depending on the radiation dose.","PeriodicalId":42588,"journal":{"name":"Nuclear Physics and Atomic Energy","volume":"21 1","pages":""},"PeriodicalIF":0.3,"publicationDate":"2022-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79465610","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}

{"title":"Cross-section calculations of photofission reactions for 238,239,240,241,242,244Pu isotopes using nuclear level density","authors":"D. Canbula, B. Canbula","doi":"10.15407/jnpae2022.01.005","DOIUrl":"https://doi.org/10.15407/jnpae2022.01.005","url":null,"abstract":"Photofission cross-sections of 238,239,240,241,242,244Pu isotopes are theoretically investigated with the collective semi-classical Fermi gas model (CSCFGM) by using Talys computer code in the energy range 1 - 30 MeV. Nuclear level density has significant importance to define the structural properties of nuclei. CSCFGM is a nuclear level density model, that includes collective (rotational and vibrational) effects as well as the pairing and shell effects, and is used to analyse the (γ, f) reactions of plutonium isotopes. The experimental data for all reactions are taken from EXFOR library. The theoretical predictions are in agreement with the experimental data, Talys code without changing the input, and the evaluated nuclear cross-section data from TENDL 2021 library.","PeriodicalId":42588,"journal":{"name":"Nuclear Physics and Atomic Energy","volume":"132 1","pages":""},"PeriodicalIF":0.3,"publicationDate":"2022-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79647122","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}