Citation: XU Jiang, WANG Wei, XI Rui-Yang, SU Yong-Yang, WANG Wen-Liang, LI Zhi-Ming, ZHAI Li-Hua, FANG Sui, ZHANG Hai-Tao, FAN Jing-Long, WANG Yu-Feng. Fingerprinting of ²³⁰Th/²³²Th in Uranium Materials for Nuclear Forensic[J]. Chinese Journal of Analytical Chemistry, ;2022, 50(2): 310-316. doi: 10.19756/j.issn.0253-3820.210552 shu

Fingerprinting of ²³⁰Th/²³²Th in Uranium Materials for Nuclear Forensic

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

Corresponding author: LI Zhi-Ming, YQ250003@nint.ac.cn
Received Date: 8 June 2021
Revised Date: 20 November 2021

Fund Project: Supported by the Special-Funded Program on National Key Scientific Instruments of China (No.2012YQ250003)

Determination of thorium isotopic ratio ²³⁰Th/²³²Th in uranium materials by multiple collector inductively coupled plasma mass spectrometry (MC-ICP-MS) was presented for nuclear forensic. One piece of UO₂ formed uranium pellet and three kinds of yellow cake powder were dissolved with ultrapure HNO₃ (7.5 mol/L). Thorium was purified for analysis using a single column prepared with TBP resin bed, with which the sample was loaded and then Th was eluted with 4 mol/L HCl. Analyses were performed on Nu Plasma MC-ICP-MS and mass-bias correction were applied to the ²³⁰Th/²³²Th using bracketing measurements of U standard. An equation was proposed to correct the contribution from Th blank for calculating the ²³⁰Th/²³²Th of the uranium materials. The results showed that the ²³⁰Th/²³²Th ratios of the uranium pellet, yellow cake powder named YC1, yellow cake powder named YC2 and yellow cake powder named YC3 were (0.479±0.037), (1.376×10^-4±4.8×10^-6), (2.8582×10^-3±2.2×10^-6) and (2.8605×10^-3±2.1×10^-6) (k=2), respectively. The determined ²³⁰Th/²³²Th ratio of the uranium pellet agreed with the reference value. The yellow cake powder named YC2 and the yellow cake powder named YC3 were from the same source, whose ²³⁰Th/²³²Th ratios agreed with each other and differed distinctly from that of another sourced yellow cake powder named YC1. It was proved that the thorium isotope ratio ²³⁰Th/²³²Th was a newly discovered and time correlated fingerprint of uranium materials.
- Uranium materials,
- Fingerprint,
- ²³⁰Th/²³²Th ratio,
- Multiple collector inductively coupled plasma mass spectrometry
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Fingerprinting of ²³⁰Th/²³²Th in Uranium Materials for Nuclear Forensic