During 10 years after the Chernobyl accident the systematical measurings of size distributions of radioactive aerosols were conducted near the block-IV. In the ground level the active median aerodynamic diameters (AMAD) of 137Cs aerosols were ranged from 0.4 up to 1.4 microns in May, 1986. In that time the aerosol carriers of radioactive Te, Ru and I had AMAD 0.3 ... 0.5 micron. During 1987-1996 AMAD of aerosol of fission products of the Chernobyl accident was stable in range 4 ... 7 microns. Simultaneously concentrations and size distributions of natural radioactive aerosols were determined. The cosmogenic 7Be aerosols had AMAD 0.5 ... 0.7 micron. AMAD of the aerosols of daughter products of radon and thoron was found 0.4 ... 0.6 micron.
Aerosols Air Pollutants, Radioactive