THE CONTENT OF SPALLATION PRODUCTS AND PU IN SOIL OF EUROPEAN PART OFUSSR AFTER CHERNOBYL NPP ACCIDENT

Radiochemical analysis of more than 500 samples of soil, aerosol, and fallout collected from the large territory of European part of the USS R (the area almost-equal-to 10(6) km2) after Chernobyl accident has be en collected. Concentration of Pu and spallation products has been det ermined. Concentration of Pu in soil surface changes from 0.001 to 13. 5 Ci/km2, Sr-90 - 0.07 to 40 Ci/km2, gamma-active spallation products - 0.01 to 3.5 . 10(5) Ci/km2. Four types of pollution have been studie d differing in comparative contents of radionuclides. A possibility wa s shown of Pu contents estimation in soil as compared to the contents of some gamma-active isotopes (Ru-106, 144Cs . Analysis of the data ob tained showed that the total amount of Pu on the surface of soils of E uropean part of the USSR is almost-equal-to 50 kg (6% of total Pu cont ent in the destroyed reactor), 137Cs - 6.3 - 10(5) Ci (8%).