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New methodology for in-situ classification of radiological items with a clearance monitor system

机译：使用间隙监控系统对放射性物品进行现场分类的新方法

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摘要

Maintenance activities and operations of high-energy particle accelerators can lead to the collection of radioactive equipment as well as waste materials. In order to ensure their proper classification as radioactive or non-radioactive, one has to quantify the activities of radionuclides produced. According to the regulatory requirements in Switzerland, these activities need to be compared with nuclide-specific clearance limits. In particular, a new set of clearance limits was introduced by the Swiss authorities in January 2018, leading to more conservative values for a number of relevant radionuclides. The present paper complements a previous one in which we developed a methodology to classify equipment with specific characteristics following a dose rate measurement. For equipment that do not fulfill these characteristics, we here extend the methodology by using a total gamma counting device. This methodology concerns the specific material compositions typically found at CERN and takes into account the latest clearance limits introduced by the Swiss authorities. Also, particular considerations are given for electronic components. Their characterization is challenging due to the multiple compositions that can be found in the literature, whereas activation mechanisms are highly sensitive to the material composition.
机译：高能粒子加速器的维护活动和操作可能会导致放射性设备以及废物的收集。为了确保将其正确分类为放射性或非放射性，必须量化所产生的放射性核素的活性。根据瑞士的法规要求，需要将这些活动与特定于核素的清除极限进行比较。特别是，瑞士当局于2018年1月引入了一套新的清除限制，导致一些相关放射性核素的值更加保守。本文是对先前的研究的补充，在先前的研究中，我们开发了一种在剂量率测量后对具有特定特征的设备进行分类的方法。对于不满足这些特征的设备，我们在这里通过使用总伽马计数设备来扩展方法。该方法论涉及通常在欧洲核子研究中心发现的特定材料成分，并考虑了瑞士当局引入的最新许可限制。此外，对电子组件也有特殊考虑。由于在文献中可以找到多种成分，因此它们的表征具有挑战性，而活化机理对材料成分高度敏感。

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