Radionuclide accumulation and dose burden in small mammals in Chernobyl zone

摘要

By results of complex research in the Chernobyl zone, peculiarities of radionuclide accumulation in small mammal organisms have been studied and radiation doses have been assessed. It is shown, that radionuclide intake is defined by trophic specialization of the animals, and how that depends on season and local changes of the animals diet. A detailed description of ~(90)Sr and ~(137)Cs distribution in organism of bank vole has been presented. Radiation dose burden has been assessed for 4 small mammal species, and for conditions of the last 7 years. As a rule, the major contributor into total dose – external beta irradiation, some less – external gamma irradiation. Internal dose depends on species radionuclide accumulation and it is mainly determined by ~(90)Sr, with the exception of the bank vole, for which an internal irradiation is more important than external, due to extremely high ~(137)Cs accumulation.