Model of radioactive atmospheric contamination falling for local sources at ground

Using the diffusion-transport equation we consider the problem of the atmospheric contamination migration. Definite investigations for volume activity of air radionuclide admixtures, vertical fluxes and surface contamination concentration are performed in the case of local sources with a finite time of action. For the quantities considered we obtained the corresponding evolution maps of iso lines in order to forecast changes of radioecology state near the sources of radionuclide contamination. (author). 8 refs., 12 figs