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首页> 外文期刊>Journal of mass spectrometry: JMS >Determination of minor isotope ratios of individual uranium particles by accelerator mass spectrometry
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Determination of minor isotope ratios of individual uranium particles by accelerator mass spectrometry

机译：加速器质谱法测定单位铀颗粒的小同位素比

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The determination of uranium isotope ratios in uranium particle is an essential technique in the analysis of environmental samples for nuclear safeguards. At present, mass spectrometry has been widely used to measure isotope ratios of uranium particles. We developed a new analytical method for measuring minor isotope ratios of individual uranium particles directly. The technique includes single particle identification by energy dispersive X-ray spectrometer (EDX), transfer by scanning electron microscope (SEM) combined with micromanipulator and isotope ratios analysis with accelerator mass spectrometry (AMS). The minor isotope ratios of individual uranium particles with four isotopic abundances and different sizes from certified reference materials were measured by AMS. The results show that the relative error (RE, i.e., the deviation of measured value from the certified value) of U-234/U-235 and U-234/U-236 isotope ratios was 9.0% and 19.3%, respectively, and the relative standard deviation (RSD) was within 9.9% and 16%, respectively. The minimum particle determined was about 2 mu m. The method was found to be an alternative analytical means for nuclear safeguards.
机译：铀颗粒中铀同位素比值的测定是核保障环境样品分析中的一项重要技术。目前，质谱已被广泛用于测量铀颗粒的同位素比值。我们开发了一种新的分析方法，可以直接测量单个铀粒子的微量同位素比值。该技术包括使用能量色散X射线光谱仪（EDX）进行单粒子识别，使用扫描电子显微镜（SEM）结合微操作器进行转移，以及使用加速器质谱仪（AMS）进行同位素比值分析。用AMS测量了具有四种同位素丰度和不同尺寸的铀颗粒的微量同位素比值。结果表明，U-234/U-235和U-234/U-236同位素比值的相对误差分别为9.0%和19.3%，相对标准偏差（RSD）分别在9.9%和16%以内。测定的最小颗粒约为2μm。该方法被发现是核保障措施的替代分析手段。

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