Archives → 2022 → Vol. 62, № 1 → pp. 75-85
Article
Software Tool for Estimating the Absorbed Dose Rate in Pine Stands in Case of Accidental Radioactive Fallout
Т. V. Perevolotskaya, А. N. Perevolotsky, S. А. Geras’kin
Russian Institute of Radiology and Agroecology, Obninsk, Russiа
Abstract
The article presents the results of development of a software tool for assessing the dynamics of absorbed dose rate of external β- and γ-radiation by the height of the pine stands during first year after the accidental radioactive fallout, taking into account dynamics of their redistribution between compartments of the system «crown surface of woody plants – surface layer of soil». The main assumptions of the software implementation using mathematical modeling methods are formulated. The estimation of radionuclide deposition on the Earth’s surface is based on the Gaussian model of atmospheric diffusion. The model (compartment) approach to the dynamics of redistribution of radionuclide activity from the composition of radioactive emissions is represented by a system of linear differential equations of first order. The calculation of absorbed dose rate is based on the integration of dose attenuation function of point source, taking into account the dose factor of accumulation of scattered radiation. The determining contribution of β-radiation from radionuclides located on surface of studied components of system is established. The developed software tool can be used for preliminary assessment of external β- and γ-radiation doses by the height of pine stands during first year after accidental radioactive fallout.
Keywords
radioactivity, crown surface of woody plants, surface layer of soil, radionuclides, β-radiation, γ-radiation, accidental radioactive fallout, absorbed dose rate, pine stands, emergency release
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