铀同位素
热解炭
氧化铀
铀
质谱法
微束
浓缩铀
核物理学
核工程
石墨
气溶胶
化学
放射化学
同位素
分析化学(期刊)
材料科学
物理
环境化学
冶金
工程类
热解
色谱法
有机化学
作者
P. M. L. Hedberg,P. Peres,Firmino Fernandes,Albert Noelle,Cécile Vincent
出处
期刊:Journal of vacuum science and technology
[American Vacuum Society]
日期:2018-02-08
卷期号:36 (3)
被引量:13
摘要
Large geometry secondary ion mass spectrometry can be efficiently used to analyze uranium aerosol particles from dust samples in the search for undeclared nuclear activities. Automated sample screening measurements are followed by more precise and accurate microbeam measurements of both the major and minor uranium isotopes on selected individual particles. The quality of this work is essential in order to be able to draw valuable safeguards conclusions. This paper describes the latest developments that have been undertaken to enhance the detection limits and to reduce the uranium isotope measurement uncertainty. It includes improvements in the analytical protocol as well as in the instrument acquisition software and data reduction method. Recent useful yield measurements have been performed on uranium monodispersed particles using different primary bombardment conditions to compare to previously obtained data. Comparison of uranium isotope measurements when using pyrolytic graphite or silica planchets as a sample substrate will also be presented.
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