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Science 4 November 1966:
Vol. 154. no. 3749, pp. 646 - 647
DOI: 10.1126/science.154.3749.646
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Articles

Manganese Nodules: Thorium-230: Protactinium-231 Ratios

William M. Sackett 1

1 Chemistry Department, University of Tulsa, Tulsa, Oklahoma

The Th230: Pa231 activity ratio in 7 of 11 manganese nodules is less than 10.8, the theoretical production ratio of activities in the ocean. This finding indicates difierential accumulation of these nuclides in authigenic deposits of manganese-iron oxide.


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Science. ISSN 0036-8075 (print), 1095-9203 (online)