Персона: Дашанова, Екатерина Александровна
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Институт ядерной физики и технологий
Цель ИЯФиТ и стратегия развития - создание и развитие научно-образовательного центра мирового уровня в области ядерной физики и технологий, радиационного материаловедения, физики элементарных частиц, астрофизики и космофизики.
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Дашанова
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Екатерина Александровна
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- ПубликацияОткрытый доступAdaptation of the model method for estimating sample uncertainty(2020) Dashanova, E. A.; Shcherbakov, A. A.; Дашанова, Екатерина Александровна; Щербаков, Александр Антонович© Published under licence by IOP Publishing Ltd.This approach to assessing the uncertainty of measurements of sample activity was developed taking into account the requirements of the laboratory for dosimetry of incorporated radionuclides within the framework of the Methodology for measuring the activity of uranium isotopes by the spectrometric method after extraction-chromatographic isolation from urine samples. A detailed analysis of the sources of uncertainties in the activity of the sample was carried out: the uncertainty of the chemical yield, the uncertainties in the measurements of the activity of the sample, the working radioactive solution (WRS), and the uncertainty in the volume. All uncertainties are divided into two types: type A and type B. Estimation of measurement uncertainty is based on a model approach. The procedure for estimating the uncertainty of the activity of the sample was successfully verified using the specialized software GUM Workbench Pro during their construction.
- ПубликацияОткрытый доступDevelopment of virtual analogues of nuclear facilities in virtual reality(2020) Dashanova, E. A.; Zadeba, E. A.; Kiryukhin, P. K.; Pugachev, P. A.; Romanenko, V. I.; Tikhomirov, G. V.; Khomyakov, D. A.; Shcherbakov, A. A.; Yushin, I. M.; Дашанова, Екатерина Александровна; Задеба, Егор Александрович; Кирюхин, Павел Константинович; Пугачев, Павел Александрович; Романенко, Владислав Игоревич; Тихомиров, Георгий Валентинович; Хомяков, Дмитрий Андреевич; Щербаков, Александр Антонович© Published under licence by IOP Publishing Ltd.Using virtual reality technology - a modern trend. The nuclear industry is no exception. This article provides an overview of mathematical models used to create virtual analogue of critical assembly Godiva in virtual reality. Godiva - there is a simple example that allows to hone techniques for creating more complex virtual analogues of nuclear reactors and nuclear facilities. Mathematical models include stationary and dynamic ones. The stationary model is based on data from calculations carried out using Monte Carlo programs such as MCU, Serpent and Geant4. An approach is also described that makes it possible to calculate the reverse multiplication from the values of the effective multiplication factor for various states of the subcritical assembly. The dynamic model allows one to calculate the neutron-physical characteristics of the supercritical assembly during fast processes such as a neutron burst. In conclusion, there are other examples of virtual analogs created using similar approaches.
- ПубликацияТолько метаданныеJustification and Application of Sufficiency Criterion for Measuring the Activity of Uranium Radioisotopes in Biological Samples ОБОСНОВАНИЕ И ПРИМЕНЕНИЕ КРИТЕРИЯ ДОСТАТОЧНОСТИ ДЛЯ ИЗМЕРЕНИИ АКТИВНОСТИ РАДИОИЗОТОПОВ УРАНА В БИОЛОГИЧЕСКИХ ПРОБАХ(2021) Molokanov, A. A.; Korneva, E. A.; Dashanova, E. A.; Дашанова, Екатерина Александровна© 2021 State Research Center, Burnasyan Federal Medical Biophysical Center of Federal Medical Biological Agency. All rights reserved.Purpose: Ensuring the fulfillment of the sufficiency n criterion when measuring the activity of uranium radionuclides in biological samples carried out within the individual monitoring programme by calculation of the uncertainty and characteristics limits for measurements. Material and methods: The sufficiency criterion definition is given, which determines the maximum value of the decision threshold for measurements carried out for the individual monitoring of workers at which the fact of non-exceeding of the annual dose limit or permissible level takes place, taking into account the uncertainty of the dose assessment. A model approach is used to calculate the sufficiency criterion and characteristics limits when measuring the radioactive material excrected by individual workers. The model approach consisted in the development of a calculation model based on the functional dependence of measured input values on the process of radiochemical preparation and subsequent spectrometric measurement of the sample. Results: A model has been developed for calculating the activity of uranium radionuclides 234U, 235U and 238U in a biological sample based on the description of the procedure for spectrometric measurement, which consisted in the deposition by the electrolytic method on the target after chromatographic extraction of uranium from the urine sample. The reference radioactive solution of the 232U radionuclide added to the sample as a reference point for determining the efficiency of uranium radionuclide separation (chemical yield). Equations are obtained for calculating the values of the decision threshold and the detection limit for the total activity of the above alpha-emitting uranium radionuclides. Using these equations, the dependence of the decision threshold and the detection limit on measurement time is determined for the given input data. This allows planning the measurement time at which the activity of uranium radionuclides in the sample can be determined reliably or at which the sufficiency criterion of the measurement method will be provided (necessary in the case when the activity is not detected, that is, the measurement result is less than the decision threshold). The values of the activity of uranium radionuclides 234U, 235U and 238U and the corresponding characteristics limits for the measurement were calculated on the basis of a real example of spectrometric measurement of the activity of uranium radionuclides in a sample. Conclusion: Ensuring the fulfillment of the sufficiency criterion when measuring the activity of uranium radionuclides in biological samples is achieved by the correct determination of the sample measurement time. This is determined by time dependence analysis of the characteristics limits (the decision threshold and the detection limit) for the measurement of the total activity of the above alpha-emitting uranium radionuclides 234U, 235U and 238U.