Mathematics – Logic
Scientific paper
May 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985gecoa..49.1155e&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 49, Issue 5, pp.1155-1164
Mathematics
Logic
7
Scientific paper
Preferential release into solution of radionuclides that result from alpha decay is a contributor to natural isotopic disequilibrium. Such release is critical to geochemical understanding of alpha-decay products and would be an undesirable characteristic of solidified nuclear waste in deep geological formations. Spontaneous annealing of the radiation damage that is responsible for the preferential release is shown to diminish the effect in thorianite and uraninite which we have found to be 550 to 1000 M.y. old, respectively. Leaching experiments and measurements of the thorium and uranium isotopes show that there is strongly enhanced release of short-lived 228 Th relative to 232 Th, but only slight enhancement of long-lived 234 U and 230 Th relative to 238 U and 232 Th. These results are interpreted in terms of natural annealing of damage occurring on a time scale between the ~10 and 10 5 years of the alpha-decay products. With a simple assumption actual times for the survival of the enhanced leaching in these minerals are ~ 15,000 years.
Eyal Yehuda
Fleischer Robert L.
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