• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文会议>INMM annual meeting >Application of the MGAU Code for Measuring 235U Enrichment at the Brazilian Safeguards Laboratory
【24h】

Application of the MGAU Code for Measuring 235U Enrichment at the Brazilian Safeguards Laboratory

机译：MGAU规范在巴西保障实验室中用于测量235U富集的应用

获取原文
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

The MGAU is a software tool for conducting uranium enrichment measurements based on highresolution gamma-ray spectroscopy. The code is capable of analyzing spectra (90 – 120 KeV region) collected from a wide variety of sample geometries and compositions. The main advantage of the code is its ability to perform spectra evaluation without a requirement for calibration with representative standards. However, it does require that the daughter isotopes be in activity equilibrium with the ~235U and ~238U parent isotopes. In order for the code to be more versatile in overcoming its limitations, a modified version of the traditional “enrichment meter” method has been also added. In order to perform confirmatory uranium enrichment measurements for safeguards purposes at a laboratory environment, the Brazilian Safeguards Laboratory is investigating the performance of a nondestructive technique based on the use of the MGAU code for analyzing of gamma-ray spectra collected from pure uranium samples (primarily natural and low enriched powders and pellets). Several new good practice procedures were implemented in order to optimize the performance of the method at the best achievable level. This includes positioning of both the high-purity germanium detector and the sample inside a lead chamber for reducing background influence, collection of replicate measurements, and application of robust statistical treatment of data to reduce random contributions from counting statistics to the final uncertainty. Also, temperature and humidity inside the laboratory were monitored so that significant influences in results could be observed. Based on the results arising from analysis of certified reference materials, this paper discusses the performance of the MGAU code version 4.0 with focus on the uncertainties related to sample-dependent effects (mass, density, matrix composition and enrichment level). The reliability of the MGAU predicted uncertainty for single measurements and the occurrence of significant biases are evaluated and reported.
机译：MGAU是用于基于高分辨率伽马射线光谱法进行铀浓缩测量的软件工具。该代码能够分析从各种样品几何形状和成分中收集的光谱（90 – 120 KeV区域）。该代码的主要优点是其执行光谱评估的能力，而无需使用代表性标准品进行校准。但是，它确实要求子同位素与〜235U和〜238U母同位素处于活性平衡。为了使代码在克服其局限性方面更具通用性，还添加了传统“浓缩仪”方法的修改版本。为了在实验室环境中出于保障目的执行确认性铀浓缩测量，巴西保障实验室正在研究基于MGAU代码的分析（从纯铀样品中收集的伽玛射线谱图的使用）的非破坏性技术的性能（主要是天然和低浓缩粉末和颗粒）。实施了一些新的良好实践程序，以在最佳可达到的水平上优化该方法的性能。这包括将高纯度锗检测器和样品都放置在铅室内，以减少背景影响，收集重复测量值，并对数据进行可靠的统计处理，以减少从计数统计到最终不确定度的随机影响。此外，还对实验室内的温度和湿度进行了监控，以便观察结果的重大影响。基于对认证参考材料进行分析的结果，本文讨论了MGAU代码4.0版的性能，重点是与样本相关效应（质量，密度，基质组成和富集水平）相关的不确定性。评估并报告了MGAU预测单次测量的不确定性的可靠性以及重大偏差的发生。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号