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首页> 外文会议>International Conference on Advances in Destructive and Non-Destructive Analysis for Environmental Monitoring and Nuclear Forensics; 20021021-20021023; Karlsruhe; DE >INVESTIGATION OF CORRELATIONS IN CHEMICAL IMPURITIES AND ISOTOPE RATIOS FOR NUCLEAR FORENSIC PURPOSES
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INVESTIGATION OF CORRELATIONS IN CHEMICAL IMPURITIES AND ISOTOPE RATIOS FOR NUCLEAR FORENSIC PURPOSES

机译：核法证目的化学杂质与同位素比的相关性研究

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摘要

The Institute for Transuranium Elements has worked in the area of nuclear forensic science since 1992, when the first seized sample was analysed. In the beginning, analytical tools for seized materials were adapted from safeguard measurements and from materials science. Especially in view of the origin, determination the spectrum of parameters to be taken into account had to be widened. In addition to the development of a comprehensive database on nuclear materials for power reactor fuels, experimental investigations were begun to identify characteristic parameters. These systematic investigations comprised the development of methodologies for age determination of plutonium and of highly enriched uranium, surface roughness determination of UO_2 pellets, on n(~(18)O)(~(16)O) measurements in uranium oxides, and on measurement of impurities. Particularly with respect to the latter, a more thorough understanding of the nature of characteristic chemical impurities and their propagation throughout the entire process appeared necessary, in particular for uranium materials. Therefore, a systematic study was launched in order to better understand which chemical impurities might be considered as characteristic of the origin of the base material and which are introduced incidentally or intentionally during processing. These impurities might be characteristic of the process used or of the plant. Impurity measurements were carried out on uranium ores, on intermediate products (ammonium diuranate or yellow cake) and on (natural) uranium oxides, all originating from the same mine, hence "vertically" throughout the process in individual facilities. Furthermore, we compared materials obtained from different mines in order to identify patterns that allow facilities to be distinguished. n(~(18)O)(~(16)O) ratio measurements provided useful additional information on geographic origin of materials. Therefore, we investigated the n(~(18)O)(~(16)O) isotope ratios in these different compounds in order to obtain further experimental evidence for a consistent set of materials reportedly originating from the same geographic location.
机译：自1992年分析第一个缉获的样品以来，超铀元素研究所一直在核法证科学领域工作。最初，从防护措施和材料科学中改编了用于缉获材料的分析工具。特别是考虑到原产地，必须扩大确定要考虑的参数范围。除了开发用于动力堆燃料的核材料的综合数据库外，还开始进行实验研究以确定特征参数。这些系统的研究包括the的确定方法和高浓铀的年龄确定方法，UO_2球团的表面粗糙度确定，基于铀氧化物中n（〜（18）O）/ n（〜（16）O）的测量以及测量杂质。特别是对于后者，特别是对于铀材料，有必要对特征性化学杂质的性质及其在整个过程中的传播进行更透彻的理解。因此，为了更好地理解哪些化学杂质可能被认为是基材起源的特征，以及哪些在加工过程中偶然或有意引入的化学杂质，开展了系统的研究。这些杂质可能是所用工艺或工厂的特征。杂质测量是在铀矿石，中间产品（二铀酸铵或黄饼）和（天然）铀氧化物上进行的，这些氧化物均来自同一矿山，因此在整个过程中都是“垂直”地在单个设施中进行的。此外，我们比较了从不同矿山获得的材料，以确定可以区分设施的模式。 n（〜（18）O）/ n（〜（16）O）比率测量提供了有关材料地理起源的有用附加信息。因此，我们研究了这些不同化合物中的n（〜（18）O）/ n（〜（16）O）同位素比率，以便获得据报道源自同一地理位置的一致材料集的进一步实验证据。

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