Ab'/> Experimental evaluation of the detection methods of thermal ionization mass spectrometry for isotopic analysis of ultra-trace level uranium
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Experimental evaluation of the detection methods of thermal ionization mass spectrometry for isotopic analysis of ultra-trace level uranium

机译：超痕量铀的同位素分析热电电离质谱检测方法的实验评价

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AbstractThermal ionization mass spectrometry (TIMS)-based isotopic analysis of various amounts of uranium was performed to experimentally evaluate three detection methods: multi-dynamic, dynamic, and static. The analytical performances of the detection methods in terms of accuracy, precision, and measurement uncertainty were not significantly different for the analysis of 1ng and 100pg of uranium, whereas using ion counters for detecting238U+signal intensity slightly enhanced the performance for analyzing 30pg of uranium. The static detection method improves the analysis performance for 5pg and 1pg of uranium due to the higher detection sensitivity of ion counters than faraday cups, elimination of ion signal drift, and increased number of valid data sets in a measurement. The experimental evaluation of the detection methods provides a basis for optimizing the detector configuration of TIMS in terms of the amount of uranium in samples. The uranium isotope ratios in microparticles measured by the static method agreed well with the certified values; this verified the applicability of the static detection method to particle analysis of environmental samples required for nuclear safeguards.Highlights?
机译：<！[cdata [ 抽象 热电电离质谱（TIMS）进行各种量的铀的同位素分析，进行了实验评估三种检测方法：多动态，动态和静态。在准确性，精度和测量不确定性方面的检测方法的分析性能对于1NG和100pg的铀的分析没有显着差异，而使用离子计数器检测 238 U + 信号强度略微增强了分析30pg铀的性能。由于离子计数器的检测灵敏度较高，静态检测方法提高了5pg和1pg铀的分析性能，而不是对法拉第杯，消除离子信号漂移，以及测量中的有效数据集数量增加。检测方法的实验评估为优化样品中铀的量优化Tims的探测器配置提供了依据。通过静态方法测量的微粒中的铀同位素比例很好地与经过认证值良好;这验证了静态检测方法适用于核保护所需的环境样品的粒子分析。 亮点 < CE：简单段id =“sp0075”查看=“全部”> ？

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