1991 Volume 40 Issue 6 Pages 240-243
Sorption of two alpha nuclides, 237Np and 239Pu, on granite was studied by the autoradiographic method using a solid state track detector (CR-39) . The autoradiographs for the surface of rock thin sections of the Inada biotite-granite which were immersed for 48 h in the ground-water containing both nuclides, showed that the alpha nuclides sorbed preferentially on biotite rather than on quartz and feldspar. Mechanism of the alpha nuclides sorption on granite was discussed based on the results of optical microscopic observations of the thin section, track density measurements and alpha-ray spectrometry. It was considered that the ion exchange seems to be a major mechanism of the sorption of these nuclides on the granite.