Determination of ~75Se, ~95Zr, ~237Np and ~241Am activities in boom clay samples form laboratory migration experiments using #gamma#-ray spectrometry

摘要

Percolation tests (i.e. routine laboratory migration experiments) have been performed to evaluate the diffusion behaviour of a number of long-lived radionuclides in Boom Clay, a candidate geological host formation for high level radioactive waste (HLW) in Belgium. Among the many potentially hazardous radionuclides under investigation are ~79Se, ~93Zr, ~237Np, ~241Am and ~243Am. Actinide migration experiments have been carried out with ~237Np and ~241Am. while for the studies with Se and Zr the radioisotopes ~75Se and ~95Zr were used. Their transport patterns in the Boom Clay were examined using a combination of a NaI(Tl) detector and High-Purity Ge detectors either on the dissolved matrix (~237Np, ~241Am) or directly on the clay (~75Se, ~95Zr).