Application of Lead and Strontium Isotope Ratio Measurements for the Origin Assessment of Uranium Ore Concentrates

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• 作者：Zsolt Varga ; Maria Wallenius ; Klaus Mayer ; Elizabeth Keegan ; Sylvain Millet
• 刊名：Analytical Chemistry
• 出版年：2009
• 出版时间：October 15, 2009
• 年：2009
• 卷：81
• 期：20
• 页码：8327-8334
• 全文大小：271K
• 年卷期：v.81,no.20(October 15, 2009)
• ISSN：1520-6882

文摘

Lead and strontium isotope ratios were used for the origin assessment of uranium ore concentrates (yellow cakes) for nuclear forensic purposes. A simple and low-background sample preparation method was developed for the simultaneous separation of the analytes followed by the measurement of the isotope ratios by multicollector inductively coupled plasma mass spectrometry (MC-ICPMS). The lead isotopic composition of the ore concentrates suggests applicability for the verification of the source of the nuclear material and by the use of the radiogenic ²⁰⁷Pb/²⁰⁶Pb ratio the age of the raw ore material can be calculated. However, during data interpretation, the relatively high variation of the lead isotopic composition within the mine site and the generally high contribution of natural lead as technological contamination have to be carefully taken into account. The ⁸⁷Sr/⁸⁶Sr isotope ratio is less prone to the variation within one mine site and less affected by the production process, thus it was found to be a more purposeful indicator for the origin assessment and source verification than the lead. The lead and strontium isotope ratios measured and the methodology developed provide information on the initial raw uranium ore used, and thus they can be used for source attribution of the uranium ore concentrates.