Influence of temperature on the speciation of radionuclides sorbed onto rocks from the Nizhnekansky massif

Abstract

The influence of temperature on speciation of actinides (Pu, Am) and some fission products (Cs, Sr), sorbed from simulated groundwater onto rocks from the Nizhnekansky massif (gneiss, dolerite) under anaerobic conditions at 20 and 90°С, was studied by sequential extraction. An increase in the contact temperature leads to an increase in the radionuclide uptake percentage and, in some cases, in the content of tightly fixed forms. The radionuclide species undergo redistribution with time.