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10Be in bauxite and commercial aluminum

10Be in bauxite and commercial aluminum,10.1016/0168-583X(94)96035-6,Nuclear Instruments & Methods in Physics Research Section B-beam Interactions Wit

10Be in bauxite and commercial aluminum   (Citations: 2)
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Five different samples of commercial aluminum have 10Be concentrations that range from a low of 40 × 106 to a high of 100 × 106 (atom 10Be)/(g Al). The beryllium-10 is probably produced in the atmosphere and introduced into aluminum ore deposits in varying amounts by rainwater during ore genesis. One modern ore, a bauxite from Haiti, contains ~ 6 × 109 atom 10Be/(g sample) or 5.7 × 1010 atom 10Be/(g Al). Geologically older, allocthonous bauxite from Arkansas contains considerably less 10Be; this observation suggests that 10Be can be used to constrain the age of the deposit. The presence of 10Be in commercial aluminum makes it inadvisable to add modern Al to small samples in which very low levels of 10Be are to be determined.
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