Retention of selenium and caesium on crystalline rock: the effect of redox conditions and mineralogical composition

Isotopes of caesium and selenium belong among fission products, being present in spent nuclear fuel (SNF) and high level waste (HLW), and contribute significantly to the risk associated with SNF and HLW disposal in deep geological repositories. The present work is focused on sorption behaviour of Cs and Se species on two types of crystalline rock, granite from Melechov massif (Czech Republic) and Aspo diorite from the underground laboratory Aspo (Sweden). The aim was to compare sorption behaviour of Cs and Se on these rocks under aerobic and anaerobic conditions and determine the influence of redox conditions on their kinetic sorption properties.