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Science 30 March 1979:
Vol. 203. no. 4387, pp. 1337 - 1340
DOI: 10.1126/science.203.4387.1337
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Articles

Geologic Migration Potentials of Technetium-99 and Neptunium-237

E. A. BONDIETTI 1 and C. W. FRANCIS 1

1 Environmental Sciences Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37830

Relatively mobile TcO+– and NpO2+ can be chemically reduced to less soluble oxidation states in the presence of igneous rocks, as predicted by oxidation-reduction measurements. Current risk assessments, which consider technetium and neptunium as potentially capable of migrating from high-level radioactive waste repositories, may be overestimating their potential hazard to the public since the Fe(II) content of many subsurface waters may maintain these elements in less soluble oxidation states.

Submitted on April 13, 1978
Revised on December 26, 1978


THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES:
Direct and Fe(II)-Mediated Reduction of Technetium by Fe(III)-Reducing Bacteria.
J. R. Lloyd, V. A. Sole, C. V. G. Van Praagh, and D. R. Lovley (2000)
Appl. Envir. Microbiol. 66, 3743-3749
   Abstract »    Full Text »    PDF »
Neptunium and Americium Speciation in Selected Basalt, Granite, Shale, and Tuff Ground Waters.
J. M. Cleveland, J. M. CLEVELAND, T. F. REES, and K. L. NASH (1983)
Science 221, 271-273
   Abstract »    PDF »
Deep Oxygenated Ground Water: Anomaly or Common Occurrence?.
I. J. Winograd, I. J. WINOGRAD, and F. N. ROBERTSON (1982)
Science 216, 1227-1230
   Abstract »    PDF »


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