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  • Improved methods to age-dat...
    Denton, Joanna S.; Wende, Allison M.; Kayzar-Boggs, Theresa M.; Cardon, April R.; Edwards, Mark A.; Sanborn, Matthew E.; Steiner, Robert E.

    Journal of radioanalytical and nuclear chemistry, 2022/12, Letnik: 331, Številka: 12
    Journal Article

    Improved methods employed at Los Alamos National Laboratory for 231 Pa/ 235 U radiochronometry are outlined. We present elution curves obtained during 233 Pa tracer preparation from 237 Np. Additionally, we report model ages for uranium certified reference materials (CRMs) exhibiting a range of 235 U enrichments including the first 231 Pa/ 235 U model ages for CRMs U200 and U900. Our results enable these CRMs to be used, with increased confidence, as quality control materials during nuclear forensics investigations.