Citation: WANG Wei, LI Zhi-Ming, XU Jiang, ZHOU Guo-Qing, ZHAI Li-Hua, LI Mei, SU Yong-Yang, WEI Guan-Yi. Isotopic Abundance Analysis of Lead in Uranium Particles by Laser Ablation Multiple Collector Inductively Coupled Plasma Mass Spectrometry[J]. Chinese Journal of Analytical Chemistry, ;2016, 44(7): 1053-1058. doi: 10.11895/j.issn.0253-3820.160164 shu

Isotopic Abundance Analysis of Lead in Uranium Particles by Laser Ablation Multiple Collector Inductively Coupled Plasma Mass Spectrometry

Northwest Institute of Nuclear Technology, Xi'an 710024, China

Received Date: 7 March 2016
Revised Date: 26 April 2016

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The isotopic abundance of lead as a signature or fingerprint in uranium has played an important role in nuclear forensics analysis. In this work, a novel analytical approach is presented to determine the isotopic abundance of lead in uranium particles by laser ablation multiple collector inductively coupled plasma mass spectrometry (LA-MC-ICP-MS). External standardization method is involved in correcting the mass fractionation in the process of analysis. The approach has been successfully validated by the measurement of CRM124-4 standard reference material. Spot size and ablation rate are set at 30 μm and 20 Hz, respectively. Laser energy density is under control to ensure that the ²⁰⁸Pb for NIST SRM612 and uranium particles are less than 1.5×10⁵ cps and 3×10⁴ cps, respectively. The results show that the relative uncertainty of ²⁰⁶Pb/²⁰⁸Pb, ²⁰⁶Pb/²⁰⁷Pb and ²⁰⁷Pb/²⁰⁸Pb ratios in CRM124-4 are less than 0.48%, 0.68% and 0.40%, respectively. Two kinds of uranium particles originated from different places have been analyzed by the proposed approach. The results demonstrate that the distinct lead isotope signatures can offer a number of evidence to determine whether the uranium particles have come directly from a mining operation or an ore-body, or whether it is anthropogenic.
- Uranium particles,
- Lead,
- Isotope ratios,
- Laser ablation multiple collector inductively coupled plasma mass spectrometry
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