title: Manganese nodules: thorium-230: protactinium-231 ratios.
abstract: The Th(230): Pa(231) 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.
authors.forename: W M
authors.initials: WM
authors.lastname: Sackett