Comparison study of RNAA and ICP-MS for the determination of ultra-traces of Th and U in geological and cosmochemical samples |
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Authors: | J Chai Y Oura M Ebihara |
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Institution: | (1) Department of Chemistry, Graduate school of Science, Tokyo Metropolitan University, Hachioji, Tokyo, 192-0397, Japan |
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Abstract: | In order to determine thorium and uranium traces in geochemical and cosmochemical samples, we developed an ICP-MS procedure, in which an anion-exchange step was introduced after sample digestion to separate major matrix elements, leading to decrease the dilution factor and increase the sensitivity for Th and U. The ICP-MS procedure was compared to the RNAA procedure which we recently developed for the same purpose. Both ICP-MS and RNAA procedures developed were found to yield similar detection limits (sub ppb) for Th and U. |
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