[Modelling of the biological availability of 137Cs in soils subjected to contamination after the accident at the Chernobyl Atomic Electric Power Station].

Results of the application of the model describing behaviour of the radionuclide in meadow ecosystems for the analysis of the factors governing of the radionuclide availability in soils are presented. The estimation of characteristics of fuel particles in "near" zone of the Chernobyl NPP is given. It's shown that in the first period after the accident the main factors determining 137Cs availability in soil are property of soil and mat as well as fallout characteristics.