Physico-Chemical Reactions In the the Underground Movement of Radioactive Isotopes

摘要

The physico-chemical state of the radioelements moving underground can influence considerably their migration velocity. In the case of exp 90 Sr--held on by monmorillonites, apatites, activated aluminum oxide--the occurrence of electronegative colloids, sorbing selectively exp 90 Sr results in an immediate break-through of this isotope. This phenomenon has been demonstrated in the case of the calcite phosphate reaction. A high pH is generally favorable to exp 90 Sr sorption (apatite, aluminum oxide). The occurrence of Ca exp 2+ ions acts very unfavorably on exp 90 Sr sorption by minerals specifics of this isotope (apatite, aluminum oxide). The same thing occurs with organic matters exp 137 Cs sorption, attributed to illitic clays, is little sensitive to the nature of the solution. Ruthenium-106 seems to move underground chiefly as a nitrosylruthenium hydroxide complex. This complex would be weakly sorbed on soil colloids by London--Van der Waals forces. (ERA citation 04:001375)