HUANG Sheng-hui, CHANG Li, CHEN Yan, ZHAO Li-fei, ZHU Liu-chao, ZHAO Xing-hong, ZHAO Yong-gang. Determination of Uranium Age by Measuring 235U/231Pa With Mass Spectrometry[J]. Journal of Nuclear and Radiochemistry, 2017, 39(5): 368-372. DOI: 10.7538/hhx.2017.YX.2016048
    Citation: HUANG Sheng-hui, CHANG Li, CHEN Yan, ZHAO Li-fei, ZHU Liu-chao, ZHAO Xing-hong, ZHAO Yong-gang. Determination of Uranium Age by Measuring 235U/231Pa With Mass Spectrometry[J]. Journal of Nuclear and Radiochemistry, 2017, 39(5): 368-372. DOI: 10.7538/hhx.2017.YX.2016048

    Determination of Uranium Age by Measuring 235U/231Pa With Mass Spectrometry

    • Isotope dilution combining with multi-collector inductively coupled plasma mass spectrometry through measuring 235U/231Pa to determine the age of high enriched uranium(HEU) was studied. The spike of 233Pa was separated from 237Np after twice TTA extraction and back-extraction. The decontamination factor(DF)(Np) in 233Pa exceeds 200. The concentration of 235U and 231Pa was measured by isotope dilution mass spectrometry using spike of 233U and 233Pa which calibrated in-house by the reference material CRM U900, respectively. So the ratio of 235U and 231Pa can be calculated, and HEU age can be obtained. The method was used to determine the age of the reference material CRM U850, and the relative error of results are 1.97%. The method can be used to measure HEU age in nuclear forensics and nuclear safeguard.
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