FIELD: protection of environment. SUBSTANCE: dislocation of radionuclide is determined in soil along the vertical line. Depth of maximal concentration of radionuclide is measured, as well as speed of convective transport of radionuclide. Diffusion coefficient is determined from mathematical dependence taking parameters measured before and time passed from the moment of single-time effluent of radioactive matter into account. EFFECT: improved efficiency; improved reliability of the method. 1 tbl
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