AN APPROACH TO DOSE RECONSTRUCTION FOR THE URALS POPULATION

Population exposure in the Urals region occurred due to the releases o f radionuclides by the Mayak plutonium facility in the 1950's, The maj or sources of radioactive contamination were the discharges of liquid wastes into the Techa river (1949-1956); an explosion in the storage f acility for high level radioactive wastes which formed the East Urals Radioactive Trace in 1957; and gaseous aerosol releases within the fir st decade of the facility's operation (1949-1957). The problems of dos e reconstruction for the population exposed on the Techa river banks a nd East Urals Radioactive Trace are outlined. The initial data sets an d basic models for dose reconstruction are described. The main tasks o f the Techa River Dosimetry System Project and the approaches to indiv idual internal and external dose reassessment are formulated.