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Natural analogues for the transuranic actinide elements: An investigation in Minas Gerais,Brazil |
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| Authors: | Merril Eisenbud Konrad Krauskopf Eduardo Penna Franca Wayne Lei Robert Ballad Paul Linsalata Kenkichi Fujimori |
| Institution: | 1. Department of Environmental Medicine, New York University Medical Center, Long Meadow Road, 10987, Tuxedo, New York 2. Stanford University, 94305, Stanford, California 3. Federal University of Rio de Janeiro, Rio de Janeiro, Brazil 4. University of S?o Paulo, S?o Paulo, Brazil |
| Abstract: | A highly weathered deposit of thorium and rare earth elements located near the summit of a hill in the state of Minas Gerais, Brazil, is being studied as an analogue for a radioactive waste repository that sometime in the distant future may be eroded to the surface or intruded by groundwater Thorium serves as an analogue for Pu4+, and La3+ as an analogue for Cm3+ and Am3+ The mobilization rate constants of the analogue elements by groundwater are so slow (of the order of 10−9 per year) as to suggest that essentially complete radioactive decay of the transuranic actinides would occur in place even under the relatively unfavorable conditions that exist at a site such as this |
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