In search of materials that could retard the migration of Tc and I, studies on the sorption and desorption of Tc and I on stibnite, molybdenite, rare-earth-hematite, chalcopyrite, galena and pyrite have been performed. The results show that Tc is strongly sorbed by stibnite, the sorption ratio is about 2 X 10® ml -g" 1 , and the sorption is irreversible. The sorption ratios for I on chalcopyrite and galena are about 100 ml · g" 1 , and sorption is also irreversible.

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