Isotopic Fractionation of Uranium in Sandstone

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Science  18 Jan 1963:
Vol. 139, Issue 3551, pp. 224-226
DOI: 10.1126/science.139.3551.224


Relatively unoxidized black uranium ores from sandstone deposits in the western United States show deviations in the uranium-235 to uranium-234 ratio throughout a range from 40 percent excess uranium-234 to 40 percent deficient uranium-234 with respect to a reference uranium-235 to uranium-234 ratio. The deficient uranium-234 is leached preferentially to uranium-238 and the excess uranium-234 is believed to result from deposition of uranium-234 enriched in solutions from leached deposits.