Geant4 Simulation of Precipitated Activity-to- γ -Dose Rate Conversion Factors for Radon and Thoron Decay Products

Valentina Yakovleva, Grigorii Yakovlev, Roman Parovik, Sergei Smirnov and Aleksey Kobzev
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Valentina Yakovleva: Nuclear Fuel Cycle Department, School of Nuclear Science & Engineering, Tomsk Polytechnic University, 634050 Tomsk, Russia
Grigorii Yakovlev: Institute of Applied Mathematics and Computer Science, Tomsk State University, 634050 Tomsk, Russia
Roman Parovik: Institute of Cosmophysical Research and Radio Wave Propagation, Far Eastern Branch of the Russian Academy of Sciences, Kamchatka Region, Elizovskiy District, 684034 Paratunka, Russia
Sergei Smirnov: Institute of Monitoring of Climatic and Ecological Systems of Siberian Branch of the Russian Academy of Sciences, 634055 Tomsk, Russia
Aleksey Kobzev: Institute of Monitoring of Climatic and Ecological Systems of Siberian Branch of the Russian Academy of Sciences, 634055 Tomsk, Russia

Mathematics, 2022, vol. 10, issue 3, 1-16

Abstract: The results of modeling the conversion factor from rainfall-deposited unit activity of gamma-emitting radon and thoron daughter decay products to their created gamma-radiation dose rate as a function of height above the Earth’s surface using the Geant4 toolkit are presented in this paper. Thin layers of water, soil, and air, with the height of 0.1–10 mm, are considered as the source in order to examine whether the composition of the radiation source environment affects the simulation result. Cases with different absorber-atmosphere densities are simulated. The contribution of each radionuclide 212 Bi, 214 Bi, 212 Pb, 214 Pb and 208 Tl to the total gamma background was determined. The dependence of dose rate growth during the precipitation period on the detector position in relation to the area covered by precipitation was investigated numerically. The obtained conversion factors are universal values, because do not depend on soil type (material) on which radionuclides are deposited by precipitation. These coefficients can be used for solving both direct tasks of radiation background recovery during precipitation and inverse tasks of determining the intensity and amount of precipitation by the known gamma background, as well as tasks to decipher the gamma background by the shape of the response to various phenomena. Also in this work, it is shown how thoron decay products can affect the response shape of gamma background on atmospheric precipitation.

Keywords: radon decay product; simulation; gamma radiation; Geant4; atmospheric precipitation; dose rate; activity (search for similar items in EconPapers)
JEL-codes: C (search for similar items in EconPapers)
Date: 2022
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