Персона: Припачкин, Дмитрий Александрович
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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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Руководитель группы "Моделирование процессов переноса радиоактивных веществ в технологических системах и окружающей среде"
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Дмитрий Александрович
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- ПубликацияТолько метаданныеInfluence of Aerosol Particle Parameters on Their Scavenging from the Atmosphere by Raindrops(2020) Pripachkin, D. A.; Budyka, A. K.; Припачкин, Дмитрий Александрович; Будыка, Александр Константинович© 2020, Pleiades Publishing, Ltd.Abstract: A microphysical model has been proposed to assess the scavenging of artificial aerosol particles from the atmosphere by raindrops, where the raindrops are regarded as a highly rarefied filtering medium. The effect of aerodynamic parameters of aerosol particles on the efficiency of their capture by raindrops E and on the scavenging coefficient Λ has been numerically investigated for different precipitation rates I. A new formula has been proposed to evaluate the efficiency of aerosol capture by the raindrops. This model has been compared with other well-known models. The proposed model has been found to describe the interaction between aerosol particles and raindrops more strictly than the microphysical models considered in this study.
- ПубликацияТолько метаданныеThe effect of varying collimator geometry in alpha spectrometry of environmental analysis(2020) Amoah, P. A.; Pripachkin, D. A.; Припачкин, Дмитрий Александрович© Published under licence by IOP Publishing Ltd.Assessment of radioactive aerosols in the atmosphere has always been an important field of study due to its effects on many biological systems. The efficiency in measuring these aerosols is therefore critical to research and industrial practice, thus; the principles and methods of geometry development to improve efficiency and resolution is paramount. The aim of this study is to use numerical simulation with MATLAB to improve the resolution and detection efficiency of an alpha spectrometer with varying collimator geometries. A collimator between a radiation source and a detector plays a very important role in identifying specific radionuclides among various species in a radioactive environment. The geometric model of the collimator being considered here is that of a triangular and a hexagonal shape. To evaluate the counts, randomly obtained data using Microsoft excel was used, considering the specified boundary conditions in a two-dimensional plane. Various counts ranging from 100 to 100,000 were analyzed to obtain the results of a log efficiency curve using MATLAB. Subsequent counting efficiency curves were then determined relative to the dimensions. An average value of 0.44 ± 0.1106 was determined for the efficiency. With emphases on the apothem of the geometries being studied, the triangular shaped collimator has theoretically shown to produce a higher resolution though with a possible decrease in detection efficiency.
- ПубликацияТолько метаданныеModeling the parameters of hot radioactivity release as a result of an accident at Chernobyl nuclear power plant(2020) Mohemmedi, B.; Mehdi, M.; Panin, M. P.; Pripachkin, D. A.; Панин, Михаил Петрович; Припачкин, Дмитрий Александрович© Published under licence by IOP Publishing Ltd.A three-dimensional Computational Fluid Dynamics (CFD) model is used to simulate the dispersion of radioactive gas from the Chernobyl accident. The most important features of the model are a totally 3-dimensional advection-diffusion equation. Computing the rise of the plume from an accident is an important point for estimating the release of radioactive gas into the atmosphere. The analysis of the plume rise at the time of the Chernobyl accident presents some special circumstances. This is caused by the very high temperature resulting from the burning of graphite. The modeling was performed using Reynolds-Averaged Navier-Stokes RANS method using the k-ϵ model delivered by the commercial code ANSYS-Fluent. The results of the simulation were verified against the measurements taken by aircraft.
- ПубликацияТолько метаданныеModel-Measuring Approach to Improving Aerosol Radiation Safety Validation Mechanisms(2021) Pripachkin, D. A.; Припачкин, Дмитрий Александрович© 2022, Springer Science+Business Media, LLC, part of Springer Nature.The mechanisms for radiation safety validation during large-scale implementation of innovative nuclear technologies in our country are examined. The influence of the physicochemical parameters of radioactive aerosols on safety is shown. A new model-measuring approach is proposed for improving the radiation safety validation mechanisms based on the integration of modern models of aerosol behavior with the means for measuring the physicochemical parameters of aerosols.
- ПубликацияОткрытый доступПРОГРАММНОЕ СРЕДСТВО ДЛЯ ОЦЕНКИ ХАРАКТЕРИСТИК САМОПРОИЗВОЛЬНОЙ ЦЕПНОЙ РЕАКЦИИ (СЦР)(НИЯУ МИФИ, 2023) Припачкин, Д. А.; Демин, В. М.; Панин, М. П.; Панин, Михаил Петрович; Демин, Виктор Максимович; Припачкин, Дмитрий АлександровичПрограмма предназначена для оценки параметров самопроизвольной цепной реакции в производственных условиях и поддержки принятия решений о мерах защиты персонала для: определения пространственных и количественных характеристик самопроизвольной цепной реакции (СЦР) для конкретных условий ядерно-опасной зоны с учетом рассеяния и поглощения нейтронов в элементах оборудования и строительных конструкциях на основе использования данных измерений импульсных нейтронных дозиметров ДБН-А03Д; получения в течение 10 - 20 с после СЦР первичной информации о возможных дозах персонала, находящегося во время СЦР в ядерно-опасной зоне. Тип ЭВМ: IBM PC-совмест. ПК; ОС: Windows 10.
- ПубликацияОткрытый доступФизико-химические основы аэрозольной безопасности на предприятиях ядерного топливного цикла(ФГБУН Институт проблем безопасного развития атомной энергетики РАН, 2024) Припачкин, Д. А.; Припачкин, Дмитрий Александрович; Будыка, А. К.
- ПубликацияТолько метаданныеRadiation and Radiological Consequences of a Hypothetical Nuclear Accident at a Nuclear Facility Located in the Positional-Home District of Atomflot(2023) Sarkisov, A. A.; Antipov, S. V.; Vysotskii, V. L.; Pripachkin, D. A.; Припачкин, Дмитрий Александрович
- ПубликацияТолько метаданныеInfluence of Modeling Conditions on the Estimation of the Dry Deposition Velocity of Aerosols on Highly Inhomogeneous Surfaces(2024) Pripachkin, D. A.; Vysotsky, V. L.; Budyka, A. K.; Припачкин, Дмитрий Александрович; Будыка, Александр Константинович