Forecast modeling of distribution of radionuclid in the surface layer of the soil
A mathematical model of radionuclides vertical migration in the surface layer of the soil is presented. The model describes the basic physical-chemical processes that determine the radionuclides behavior within the unsaturated zone of the soil cover. The simulation results of Sr<sup>90</sup>, Cs<sup>137</sup> and U migration from the soil surface due to infiltration of atmospheric precipitation are presented.