Citation: WANG Wei, LI Zhi-Ming, XU Jiang, ZHOU Guo-Qing, SU Yong-Yang, WU Yan-Min, WEI Guan-Yi, FANG Sui, WANG Wen-Liang. Determination of ²⁴⁰Pu/²³⁹Pu in Plutonium-containing Particle by Laser Ablation Multiple Collector Inductively Coupled Plasma Mass Spectrometry[J]. Chinese Journal of Analytical Chemistry, ;2017, 45(11): 1719-1726. doi: 10.11895/j.issn.0253-3820.171028 shu

Determination of ²⁴⁰Pu/²³⁹Pu in Plutonium-containing Particle by Laser Ablation Multiple Collector Inductively Coupled Plasma Mass Spectrometry

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

Received Date: 22 June 2017
Revised Date: 10 September 2017

Fund Project: This work was supproted by the National key Foundation for Exploring Scientific Instrumet of China (No. 2012YQ250003)

The isotopic fingerprints of plutonium are extremely important for nuclear safeguards and nuclear forensics. An analytical method was developed for direct determination of ²⁴⁰Pu/²³⁹Pu ratio in plutonium-containing particles by laser ablation multiple collector inductively coupled plasma mass spectrometry (LA-MC-ICP-MS). The risk of ablated particles leakage was reduced by leak detection, exhaust hood, and swiping the laser cell. Scanning mobility particle sizer (SMPS) was used to measure the effect of ablation parameters on the size distribution of ablated particles. The results showed that the majority of ablation material presented as particles from 40-500 nm and the sweep time after laser ablation should be longer than 15 min. The particle size was evaluated to guide LA-MC-ICP-MS system. By using external normalization method for correction of the mass fractionation correction factor and ion counter efficiencies measured by nebulizer-coupled MC-ICP-MS, a LA-MC-ICP-MS method was established for analysis of ²³⁹Pu/²⁴⁰Pu ratio in plutonium particles. Spot size, ablation rate and laser dwell time were set at 30 μm, 5 Hz and 5 s, respectively. Laser energy density was controlled to ensure that the intensities of ²³⁹Pu for plutonium-containing particles were about 2×10⁴ cps and 2×10⁵ cps, respectively. The analytical results showed that the relative uncertainties for ²³⁹Pu/²⁴⁰Pu was less than 1.4% (n=6), and the measured value deviated by less than 4.7% from the reference value. The time for adjusting system and determining ²³⁹Pu/²⁴⁰Pu ratio in single plutonium particle was 9 h and 0.5 h, respectively. The results demonstrated that this technique was rapid, precise and accurate, and could be used for determination of ²³⁹Pu/²⁴⁰Pu in plutonium-containing particles.
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Determination of ²⁴⁰Pu/²³⁹Pu in Plutonium-containing Particle by Laser Ablation Multiple Collector Inductively Coupled Plasma Mass Spectrometry