为了快速定量地分析待测样品中铀元素含量信息, 采用激光诱导击穿光谱技术结合内标法, 通过脉宽为7ns、输出能量为20mJ的纳秒激光脉冲诱导涂有硝酸双氧铀的石墨片产生等离子体光谱, 测量了波长范围为300nm~800nm的光谱数据, 对涂有不同浓度的铀样品进行了定量分析以及理论分析和实验验证, 取得了UⅡ 409.01nm和UⅡ 367.01nm谱线和CⅠ 373.72nm, CⅡ 383.57nm, CⅢ 378.94nm谱线数据。结果表明, 样品浓度低于5.0×10-3mol/m2(本文中研究的是面密度)时, 铀归一化强度与铀浓度存在较好的线性关系, 激光诱导击穿光谱技术与内标法结合可以用于快速定量分析待测样品中铀元素含量信息。该研究为核污染和铀矿中微量铀元素的快速检测分析提供了参考。

Using laser-induced breakdown spectroscopy(LIBS) combined with internal standard method to achieve the aim of analyzing the information of uranium concentration in samples fast and quantitatively, the 300nm~800nm spectra of 7ns, 20mJ nanosecond laser pulse induced graphite sheet coated with uranyl nitrate were detected by echelle spectrometer and ICCD, quantitative analysis of uranium samples coated with different concentrations was done. Theoretical analysis and experimental verifications were made to obtain the spectra data of UⅡ 409.01nm, UⅡ 367.01nm, CⅠ 373.72nm, CⅡ 383.57nm and CⅢ 378.94nm. The results show that there is a good linear relationship between normalized uranium intensity and uranium concentration when the sample concentration is lower than 5.0×10-3mol/m2(surface density was studied in this paper), the combination of LIBS and internal standard method could realize the rapid quantitative analysis of uranium concentration in the samples, this study provides reference for the rapid detection and analysis of trace uranium element in nuclear contamination and uranium ore.