Manganese Nodules: Thorium-230: Protactinium-231 Ratios

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Science  04 Nov 1966:
Vol. 154, Issue 3749, pp. 646-647
DOI: 10.1126/science.154.3749.646


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.