  Data characterizing the pollution of the Yenisei River (water and bottom
sediment) by radionuclide resulting from the use of the river water for cooling
industrial reactors in the Mining-Chemical Complex are presented. Studies have
been made of the contamination of the river during the period when reactors
with direct flow cooling were used and after these were shut down. Distinctive
features of the migration of radionuclide in the Yenisei are noted, in
particular, their distribution between the solid and liquid phases. The amounts
of 137Cs, 65Zn, 60Co, 54Mn, and 152Eu in the channel are determined from the
effluent discharge site to Dudinka port. The rate of continuous self removal of
137Cs is estimated to be 0.19 1/year, corresponding to a half purification time
of 3.6 years for a 600 km long segment of the river bed.
