We present the results of a study to generate reference glasses that reflect an environment analogous to historic nuclear fallout samples of interest for post-detonation nuclear forensics. The glasses were generated by melting and then quenching SiO₂, Al₂O₃ and CaCO₃ powders. Two suites of glasses with three distinct U isotopic ratios were successfully made with enrichments in the ²³⁵U isotope (~ natural [0.72%], ~ 53% and 94%), but the bulk elemental data showed heterogeneity (~ 10% RSD) with U mass fractions ranging from 331.47 to 373.63 μg g^-1. Spatially resolved U isotopic measurements were performed using three mass spectrometry techniques (secondary ion mass spectrometry-single stage accelerator mass spectrometry [SIMS-SSAMS], large geometry [LG] - SIMS, and laser ablation-inductively coupled plasma-mass spectrometry [LA-ICP-MS]) across five National Laboratories. The results showed good agreement with the bulk U isotopic data for the low, medium, and high U mass fractions. We conclude that despite elemental heterogeneity, these samples can serve as useful working reference materials for spatially resolved nuclear fallout analyses, as well as for other related spatially resolved analyses.

中文翻译：

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低质量分数铀玻璃工作参考材料的空间分辨表征

我们展示了一项研究结果，旨在生成参考玻璃，该参考玻璃反映了类似于爆炸后核法证学感兴趣的历史核尘埃样本的环境。通过熔化然后淬火SiO ₂、Al ₂ O ₃和CaCO ₃粉末来生成玻璃。^{通过富集235} U 同位素（~天然 [0.72%]、~ 53% 和 94%），成功制备了两套具有三种不同 U 同位素比率的玻璃，但大量元素数据显示出异质性（~ 10% RSD） U质量分数范围为331.47至373.63 μg g ^-1。使用三种质谱技术（二次离子质谱-单级加速器质谱 [SIMS-SSAMS]、大几何结构 [LG] - SIMS 和激光烧蚀-电感耦合等离子体质谱 [LA-] 进行空间分辨 U 同位素测量ICP-MS]）跨越五个国家实验室。结果表明，低、中、高 U 质量分数与大量 U 同位素数据非常吻合。我们的结论是，尽管存在元素异质性，但这些样品可以作为空间分辨核沉降物分析以及其他相关空间分辨分析的有用工作参考材料。