Abstract
Autoradiography, coupled with classical petrographic techniques, has been used to determine the distribution of radionuclides sorbed under oxic conditions onto rock thin sections representative of the four major types of plutons in the Canadian Shield, to determine which minerals are most effective in removing radionuclides from aqueous solutions. Kodak® spectroscopic and Ilford® K. 5 nuclear emulsion plates were investigated. The Ilford® film was found to give higher resolution and required a shorter exposure time than the Kodak® film. Sorption was found to be negligible on quartz and strongest on the mafic minerals — the pyroxenes, micas, hornblende and opaques, and on alteration minerals — chlorite and sphene. Precipitation of Am and Pm was observed, indicating that, for actinides and rare earths, experimentally obtained static sorption coefficients may reflect precipitation as well as sorption and must be used with caution in modelling studies.
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