Radioecological model for transport of radioiodine and radiocesium in food chains after radiological accidents and discharge of radioactive substances to atmosphere for study of mechanism of formation of internal radiation doses to population. Part 3. Description, formulation and properties model components for metabolism of 131I and 137Cs in human organs

Description, formulation and properties of model components for metabolism of 131I и 137Cs in human organs after radiological accident and atmospheric discharge of radioactive substances is described. The model allows to investigate effects of dynamics of fallout of radionuclides, weather conditions, individual characteristics of the residents, their diet, content of 131I and 137Cs in a body, as well as formation of internal radiation doses. Mentioned conditions were shown to determine dynamics of content of 131I and 137Cs in a human body. To reconstruct individual internal radiation doses by radiometry data qualitative diet characteristics should be known. Lack of the information increases uncertainty in individual dose estimating. In the affected territories of Russia the main contributor to the internal dose is 131I entered the thyroid by inhalation. Maximal radioactivity of 131I in the thyroid was twofold higher in residents of the Bryansk region than of Kaluga region.