Radioxenon activity concentrations are monitored globally using the International Monitoring System (IMS) of the Comprehensive Nuclear-Test-Ban Treaty Organisation, improving the monitoring community's ability to detect radionuclide signatures from an underground nuclear test (UNT). An IMS-like noble gas system is in operation at AWE (Aldermaston, UK) and can collect and measure radioxenon isotopes in environmental air samples. When operated in this mode, data produced is analysed at the UK National Data Centre (NDC) and significant detection events are flagged for further investigation. This work discusses a number of significant detection events analysed using the operational system deployed at the UK NDC, which includes atmospheric transport simulations and a real-time stack-monitoring data feed from the nearest medical isotope production facility in Belgium. A comparison of the expected radionuclide contributions with measured detections is presented, including a comparison of the isotopic ratios for the radioxenon isotopes of interest (¹³³Xe, ^131mXe, ^133mXe, ¹³⁵Xe).

使用全面禁止核试验条约组织的国际监测系统（IMS）在全球范围内监测放射性氙的浓度，从而提高了监测界从地下核试验（UNT）中检测放射性核素特征的能力。类似于IMS的稀有气体系统正在AWE（英国Aldermaston）运行，可以收集和测量环境空气样本中的放射性氙同位素。当以这种模式操作时，生成的数据将在英国国家数据中心（NDC）进行分析，并标记出重大检测事件以进行进一步调查。这项工作讨论了使用英国NDC部署的操作系统分析的许多重要检测事件，其中包括大气传输模拟和来自比利时最近的医学同位素生产设施的实时堆栈监控数据馈送。给出了预期的放射性核素贡献与实测检测值的比较，包括感兴趣的放射性氙同位素的同位素比值的比较（¹³³ Xe，^131m Xe，^133m Xe，¹³⁵ Xe）。