Citation: WANG Wei, FANG Sui, XU Jiang, LI Zhi-Ming, YUAN Xiang-Long, SHEN Xiao-Pan, ZHAI Li-Hua, DENG Hu, LIN Jian-Feng, KE Chang-Feng. Application of Multiple Collector Inductively Coupled Plasma Mass Spectrometry for Single Uranium Particle Analysis[J]. Chinese Journal of Analytical Chemistry, ;2018, 46(8): 1245-1252. doi: 10.11895/j.issn.0253-3820.181053 shu

Application of Multiple Collector Inductively Coupled Plasma Mass Spectrometry for Single Uranium Particle Analysis

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

Received Date: 24 January 2018
Revised Date: 1 June 2018

Fund Project: This work was supported by the National Major Scientific Instruments and Equiments Specical Project (No. 2012YQ250003)

Analysis of uranium particles is extremely important for nuclear safeguards and nuclear forensics. This work describes the technical advancements for determining uranium isotope ratios and ²³⁰Th/²³⁴U in single uranium particle without chemical separation procedure by multi-collector inductively coupled plasma mass spectrometer (MC-ICP-MS). The proposed method includes:(1) measuring the ²³⁸U, ²³⁰Th and ²³²Th in the procedure blank samples; (2) dispersing the particles with ultrasonic concussion; (3) indentifying the uranium particles using SEM-EDX; (4) transferring single particle to PFA bottle by micromanipulator; (5) dissolving the particles in 0.1 mL HNO₃ at 7.5 mol/L; (6) Measuring ²³⁵U/²³⁸U, ²³⁴U/²³⁵U and ²³⁶U/²³⁵U by MC-ICP-MS; (7) Determinating ²³⁰Th/²³⁴U. Results show that the total mass of ²³⁸U and ²³²Th in process blank is less than 8×10^-5 ng and 1.5×10^-3 ng, respectively. The relative expanded uncertainties for ²³⁵U/²³⁸U, ²³⁴U/²³⁵U, ²³⁶U/²³⁵U and ²³⁰Th/²³⁴U in CRM124-4, GBW04234 and GBW04238 could be better than 3.6%, 3.5%, 3.8% and 15% (k=2), respectively. The results agree with the certificated values within uncertainty range. In addition, an alternative approach for measuring ²³⁵U/²³⁸U, ²³⁴U/²³⁵U, ²³⁶U/²³⁵U and ²³⁰Th/²³⁴U in single uranium particle is proposed for nuclear forensics and nuclear safeguard.
- Particle analysis,
- Uranium isotope ratios,
- ²³⁰Th/²³⁴U ratio,
- Multiple collector inductively coupled plasma mass spectrometry
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