热表面电离质谱法测定贫化铀样品痕量铀同位素比值及含量

收稿日期: 2009-08-26

修回日期: 2009-12-15

刊出日期: 2010-08-28

Determinationof Isotope Ratios and Concentration of Trace Uranium in Depleted Uranium Samples by Thermal Ionization Mass Spectrometry

Received Date: 26 August 2009

Revised Date: 15 December 2009

Publish Date: 28 August 2010

摘要: 选用磷酸为离子流发射剂,热表面电离质谱法分析纳克量级贫化铀样品的铀同位素比值,方法最大相对标准偏差＜2.9％。以233U为稀释剂,采用同位素稀释法对铀的含量进行测定,扩展不确定度为2.4%(K=2)。研究表明,在纳克量级的铀同位素比值测定中,来自铼带等铀本底的干扰影响不容忽视,需要进一步研究并扣除。
- 铀 /
- 同位素 /
- 纳克量级 /
- 贫化铀样品 /
- 热表面电离质谱法
Abstract: With H3PO4 as the ionization intensifier, the isotope ratios of uranium in the depleted uranium samples with uranium concentration at nanogram-level were determined by thermal ionization mass spectrometry (TIMS) with the precision of ＜2.9％RSD. With 233U as the diluent, the concentration of uranium in the samples were also determined by isotope dilution mass spectrometry (IDMS) with the expanded uncertainty of 2.4% .The research results showed that in uranium isotope ratio determination for the samples with nanogram-level of uranium, uranium background interference from rhenium filament and other sources should not be ignored, which is needed for further study to remove the background interference.
- uranium /
- isotope /
- nanogram-level /
- depleted /
- uranium