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《Chinese Journal of Analytical Chemistry》 2017-11
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Determination of~(240)Pu/~(239)Pu in Plutonium-containing Particle by Laser Ablation Multiple Collector Inductively Coupled Plasma Mass Spectrometry

WANG Wei;LI Zhi-Ming;XU Jiang;ZHOU Guo-Qing;SU Yong-Yang;WU Yan-Min;WEI Guan-Yi;FANG Sui;WANG Wen-Liang;Northwest Institute of Nuclear Technology;  
The isotopic fingerprints of plutonium are extremely important for nuclear safeguards and nuclear forensics. An analytical method was developed for direct determination of~(240)Pu/~(239)Pu ratio in plutoniumcontaining particles by laser ablation multiple collector inductively coupled plasma mass spectrometry( LAMC-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 ~(239)Pu/~(240)Pu 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 of239 Pu for plutonium-containing particles were about 2 × 104 cps and 2×105 cps,respectively. The analytical results showed that the relative uncertainties for239 Pu/240 Pu 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 ~(239)Pu/~(240)Pu 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 ~(239)Pu/~(240)Pu in plutonium-containing particles.
【Fund】: 科技部重大仪器专项资助项目(No.2012YQ250003)~~
【CateGory Index】: O657.63;X830
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