Citation: FU Zhong-Hua, LONG Kai-Ming, LIU Xue-Mei, HAN Jun, TANG Lei. Analysis of Trace Thorium in Uranium Sample Using Isotope Dilution Mass Spectrometry[J]. Acta Physico-Chimica Sinica, ;2015, 31(S1): 14-18. doi: 10.3866/PKU.WHXB2014Ac06 shu

Analysis of Trace Thorium in Uranium Sample Using Isotope Dilution Mass Spectrometry

1.
Institute of Nuclear Physics and Chemistry, China Academy of Engineering Physics, Mianyang 621900, Sichuan Province, P. R. China

Corresponding author: FU Zhong-Hua,

Separation and purification methods for trace thorium and other impurity elements in uranium are important. Accurate and precise measurements can be made using isotope dilution mass spectrometry. In this study, we spiked samples with ²³⁰Th using alkaline anion exchange and tri-n-butyl phosphate (TBP) extraction chromatography stack columns for separating trace thorium and other impurity elements in uranium from an 8 mol·L^-1 nitric acid medium. In this separation method, thorium was adsorbed on the alkaline anion exchange resin, uranium was adsorbed on the TBP chromatography powder, and other impurity elements were not adsorbed on the alkaline anion exchange resin or the TBP chromatography powder. The purified thorium samples were analyzed using thermal ionization mass spectrometry. The results showed that the thorium content in uranium was (59.3±0.1) μg·g^-1, the expanded factor (k) was 2, and the confidence was 95%.
- Uranium,
- Trace thorium,
- Anion exchanger,
- TBP extraction chromatography,
- Stack columns,
- Isotope dilute mass spectrometry
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