Accurate measurement of uranium isotope ratios in solid samples by laser ablation multi-collector inductively coupled plasma mass spectrometry†,Journal of Analytical Atomic Spectrometry

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Accurate measurement of uranium isotope ratios in solid samples by laser ablation multi-collector inductively coupled plasma mass spectrometry†
Journal of Analytical Atomic Spectrometry ( IF 3.1 ) Pub Date : 2018-05-14 00:00:00 , DOI: 10.1039/c8ja00006a
Z. Varga _{1,

2,

3,

4,

5} , M. Krachler _{1,

2,

3,

4,

5} , A. Nicholl _{1,

2,

3,

4,

5} , M. Ernstberger _{1,

2,

3,

4,

5} , T. Wiss _{1,

2,

3,

4,

5} , M. Wallenius _{1,

2,

3,

4,

5} , K. Mayer _{1,

2,

3,

4,

5}

Affiliation

A multi-collector inductively coupled plasma mass spectrometer (MC-ICP-MS) coupled to a 213 nm ns-laser was used to measure uranium isotope ratios (²³⁴U/²³⁸U, ²³⁵U/²³⁸U, and ²³⁶U/²³⁸U) in six solid nuclear certified reference materials (CRMs). The powdered CRMs, containing depleted, natural and low enriched uranium (U), were pressed into pellets, for straightforward handling of the nuclear material. Being analysed without dissolution, the experimental U isotope ratios of the solid materials were in good agreement with the corresponding certified values. The measured U isotope ratios in the samples were corrected for mass bias using a pelletised CRM containing nominally 2% enriched ²³⁵U. Scanning electron microscopy investigations of an actual sample from which material was previously ablated revealed that only 5 ng of sample is consumed during a single measurement. As such laser ablation MC-ICP-MS can be regarded as quasi-non-destructive and therefore is an ideal technique for the rapid but still accurate and precise determination of the uranium isotopic composition in solid samples for nuclear safeguards and forensic purposes. The proposed analytical procedure essentially assists the characterisation of the illicit nuclear material for hazard and origin assessment. Moreover, as the sample is also an evidence, it can be analysed with further techniques.

中文翻译：

激光烧蚀多收集器电感耦合等离子体质谱法精确测量固体样品中的铀同位素比†

使用耦合到213 nm ns激光的多收集器电感耦合等离子体质谱仪（MC-ICP-MS）测量铀同位素比（²³⁴ U / ²³⁸ U，²³⁵ U / ²³⁸ U和²³⁶ U / ²³⁸ U ），并在六种固体核认证参考材料（CRM）中使用。将含有贫化，天然和低浓缩铀（U）的粉末状CRM压制成小丸，以便直接处理核材料。在不溶解的情况下进行分析，固体材料的实验U同位素比与相应的认证值高度吻合。使用标称含有2％富集物的粒状CRM校正样品中测得的U同位素比率的质量偏差²³⁵ U.对先前已消融了材料的实际样品进行的扫描电子显微镜研究表明，单次测量仅消耗了5 ng的样品。像这样的激光烧蚀，MC-ICP-MS可以被认为是准无损的，因此是一种理想的技术，用于快速但仍准确而精确地确定固体样品中的铀同位素组成，以用于核保障和法医目的。拟议的分析程序从根本上协助了对危险和来源评估非法核材料的表征。此外，由于样品也是证据，因此可以使用其他技术进行分析。

更新日期：2018-05-14

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