[The dynamics of 137Cs and 40K accumulation in the tissue of food species of fish in the Tobol and Irtysh Rivers during 1995-2007].

The results of long-term investigations of 137Cs and 40K accumulation in the tissue of food species of fish in the Tobol and Rivers were analyzed. It was revealed, that the highest specific activity of 137Cs is characteristic for predatory species of fish. Yearly, seasonal and age peculiarities of 137Cs accumulation in fish were examined in this work.

[The peculiarities of accumulation of 137Cs in fish of the highest trophic level from the reservoirs polluted by radioactive nuclides as a result of the ChNPP].

In this paper, we analyze the results of long-term investigations of 137Cs accumulation in the specimens of fish of the highest trophic level, pike and pike perch, from the reservoirs suffered as a result of the ChNPP. Annual, seasonal and age peculiarities of accumulation of the 137Cs specific activity in the predatory fish from the Kiev reservoir and Teterev River were considered. It was shown, that during the whole time of radioecological investigations the pike was characterized by the higher level of 137Cs specific activity muscles in comparison with other predatory fish, in particular, pike perch.

[The variability of the biochemical status of populations of the bank vole (Clethrionomys glareolus) subjected to the chronic action of ionizing radiation in relation to the time of their inhabiting radionuclide-contaminated areas].

The existence of a population of bank voles in the course of long time (50-60 years) in conditions of chronic ionizing radiation at low doses, promoted adaptation of this populations of rodents to the action of this factor. As opposed to, in a population of bank voles, living radionuclide-contaminated areas during 8-years after the Chernobyl accident, adaptation was not observed.

[Radiation exposure of cultured tissue cells and animals (mice) within 10-kilometers zone of accident at Chernobyl nuclear plant. Effect on radiosensitivity to future radiation].

The effect of chronic low-level radiation exposure on radiosensitivity to posterior acute irradiation at high doses has been studied. Cells and mice were exposed within the ten-kilometer zone of Chernobyl disaster during various spaces of time (1-12 days), then over one or more days were additionally irradiated by doses of 1-4 Gy. It was shown that no adaptive response was developed under chronic exposure of cells and mice within the zone of disaster.

[Results of experimental radiobiological studies made within the 10-kilometer zone of the Chernobyl AES accident].

A study was made of the effect of high radioactive contamination on the animal organism (C57BL/6 mice) and HeLa cell culture within the ten-kilometer zone of the Chernobyl A.P.S.