Measurement of uranium isotope ratio by laser ablation absorption spectroscopy

doi:10.7498/aps.70.20210193

	Measurement of uranium isotope ratio by laser ablation absorption spectroscopy
	Ye Hao 1,2,3; Huang Yin-Bo 1,3; Wang Chen 4; Liu Guo-Rong 4; Lu Xing-Ji 1,3; Cao Zhen-Song 1,3; Huang Yao 1,3; Qi Gang 1,2,3; Mei Hai-Ping 1,3
刊名	ACTA PHYSICA SINICA
	2021-08-20
卷号	70
关键词	laser ablation plasma atomic absorption spectroscopy isotopic ratio analysis
ISSN号	1000-3290
DOI	10.7498/aps.70.20210193
通讯作者	Cao Zhen-Song(zscao@aiofm.ac.cn)
英文摘要	High precision measurement of uranium isotope ratio (U-235/U-238) has important application in the field of nuclear energy safety. In this paper, based on high sensitivity tunable absorption spectroscopy technology, combined with the sample processing method of pulsed laser ablation plasma, high-precision measurement of uranium U-235/U-238 isotope ratio in solid material is realized. In the experimental measurement, transitions near 394.4884 nm/394.4930 nm (vacuum) are selected as the U-235/U-238 analytical lines. The influence of buffer gas and its pressure on the persistence time of uranium atom in laser ablated plasma are studied in detail. The experimental results show that different buffer gases have different ability to restrict the movement of particles in the plasma, which leads to different longitudinal expansion velocity of the plasma (perpendicular to the surface of the sample), and increases the persistence time of uranium atoms in the laser beam. The effect of pressure change on plasma evolution can be reduced by adding buffer gas. When helium is used as the buffer gas, the persistence time of uranium atoms in the plasma is longer, which can improve the selection space of data acquisition delay. In the ablation environment with helium, the electron number density of laser ablated plasma is relatively low, which can reduce the influence of Stark broadening effect and obtain narrower absorption lines, which is more conducive to the measurement of uranium atomic absorption spectrum. In order to reduce the influence of Doppler shift effect on absorption spectrum measurement and avoid misjudgment in spectrum analysis, it is more appropriate to carry out experimental measurement after 3 mu s sampling delay. Through experiments, the optimal conditions for measuring atomic absorption spectrum of uranium are obtained. Under these conditions, five different samples with U-235 content of 4.95%, 4.10%, 3.00%, 1.10% and 0.25% respectively are measured, and the high-resolution absorption spectrum signals of U-235 and U-238 are obtained. The absorption spectra of samples with different content are measured and statistically analyzed, the U-235 absorption signal has high linearity, the fitting correlation coefficient can reach 0.989, and the limit of detection is 0.033% (3s). The stability test of absorption spectrum signal shows that the relative standard deviation of U-238, U-235 and U-235/U-238 signals are 2.054%, 2.152% and 0.524% respectively. The wavelength scanning mode is superior to the fixed wavelength spectrum measurement, and the influence of the energy fluctuation between different ablation pulses on the spectrum measurement is weakened by the wavelength scanning mode to a certain extent. The results show that laser ablation combined with absorption spectroscopy technology is suitable for uranium isotope ratio analysis and has great potential applications in rapid isotope analysis of nuclear fuel.
资助项目	Strategic Priority Research Program of Chinese Academy of Sciences[XDA17010104]
WOS研究方向	Physics
语种	英语
出版者	CHINESE PHYSICAL SOC
WOS记录号	WOS:000690386300011
资助机构	Strategic Priority Research Program of Chinese Academy of Sciences
内容类型	期刊论文
源URL	[http://ir.hfcas.ac.cn:8080/handle/334002/125203]
专题	中国科学院合肥物质科学研究院
通讯作者	Cao Zhen-Song
作者单位	1.Chinese Acad Sci, Anhui Inst Opt & Fine Mech, Key Lab Atmospher Opt, HFIPS, Hefei 230031, Peoples R China 2.Univ Sci & Technol China, Grad Sch, Sci Isl Branch, Hefei 230026, Peoples R China 3.Adv Laser Technol Lab Anhui Prov, Hefei 230037, Peoples R China 4.China Inst Atom Energy, Dept Radiochem, Beijing 102413, Peoples R China
推荐引用方式 GB/T 7714	Ye Hao,Huang Yin-Bo,Wang Chen,et al. Measurement of uranium isotope ratio by laser ablation absorption spectroscopy[J]. ACTA PHYSICA SINICA,2021,70.
APA	Ye Hao.,Huang Yin-Bo.,Wang Chen.,Liu Guo-Rong.,Lu Xing-Ji.,...&Mei Hai-Ping.(2021).Measurement of uranium isotope ratio by laser ablation absorption spectroscopy.ACTA PHYSICA SINICA,70.
MLA	Ye Hao,et al."Measurement of uranium isotope ratio by laser ablation absorption spectroscopy".ACTA PHYSICA SINICA 70(2021).