We introduce an improved particle collection method for uranium isotopic analysis using secondary ion mass spectrometry (SIMS). A new design was applied to a vacuum-suction impactor to promote the dispersibility of collected particles and the air flow rate was adjusted to maximize the particle recovery yield. The improved method remarkably mitigated the ‘mixing effect’. Materials from a nuclear forensic exercise were also employed to evaluate the method applicability. This innovation will be useful to improve the accuracy of SIMS uranium particle analysis, especially for overloaded samples with mixed isotope compositions.

中文翻译：

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改进粒子收集方法以减轻使用二次离子质谱法对环境样品进行铀同位素分析过程中的混合效应

我们介绍了一种改进的粒子收集方法，用于使用二次离子质谱法 (SIMS) 进行铀同位素分析。真空抽吸式冲击器采用了新设计，以提高收集到的颗粒的分散性，并调整空气流速以最大限度地提高颗粒回收率。改进的方法显着减轻了“混合效应”。来自核法医演习的材料也被用于评估该方法的适用性。这一创新将有助于提高 SIMS 铀粒子分析的准确性，特别是对于具有混合同位素组成的超载样品。