• 责任者：Guo Dongfa (Beijing Research Institute of Uranium Geology ; Beijing 100029 ; China) ; Zhang Yanhui
• 刊名：Rock and Mineral Analysis
• 出版年：2009
• 卷期：28(2)
• 关键词：ICP—MS ; 铀同位素 ; uranium isotopes
• 页码：p.101-107
• 图表：2 illus., 6 tables, 12 refs.
• 分类号：0900
• issnNo：ISSN0254-5357
• isbnNo：CN11-2131/TD

Uranium ore samples are decomposed with HF-HNO₃-HCl in sealed vessels. Anion exchange resin is used to separate U from Th and Ra, Th from Ra. Sr-specific resin is applied to separate Ra from Ba and other elements. Purified U, Th and Ra (solutions) are used for measurement of ²³⁴U/²³⁸U, ²³⁰Th/²³²Th and ²²⁸Ra/²²⁶Ra by HR-ICPMS. The precision of the isotopic ratio measurements for ²³⁴U/²³⁸U, ²³⁰Th/²³²Th and ²²⁸Ra/²²⁶Ra depends on their isotopic ratios and the concentration of relative nuclides. For a 10 ng/mL natural uranium solution, the isotopic ratio measurement precision for ²³⁴U/²³⁸U is better than 1.2%RSD, for a solution with 0.6 ng/mL of ²³⁰Th and nearly equal concentration of ²³⁰Th and ²³²Th, the measurement precision for ²³⁰Th/²³²Th is 1.2%RSD and for a solution with 0.48 pg/mL of ²²⁸Ra and nearly equal concentration of ²²⁸Ra and ²²⁶Ra, the measurement precision for ²²⁸Ra/²²⁶Ra is 4.0%RSD.