HOT PARTICLES AFTER CHERNOBYL ACCIDENT

The principles and methods of discovering and study of ''hot particles '' formed after Chernobyl accident in 1986 are discussed. Definition a nd classification of ''hot particles'' are given. Experimental data on ''hot particles'' distribution are given as well as on the elements a nd radionuclides present. A part of ''hot particles'' in total gamma-r adioactivity of soil within 30-km zone around Chernobyl NPP was determ ined. A technique of ''hot particles'' extraction from soil samples by using collimated microradiometer is discussed.