GBL15, the UK’s noble gas certified Comprehensive Nuclear-Test-Ban Treaty (CTBT) radionuclide laboratory supports the International Monitoring System (IMS) through measurement of environmental radioxenon samples using $\beta -\gamma$ coincidence spectrometry. GBL15 currently utilises a system comprised of NaI(Tl) $\gamma$-detectors and plastic scintillator $\beta$-detectors to measure coincident emissions from the four radioxenon isotopes of interest: ${}^{\text{133}}$Xe, ${}^{\text{135}}$Xe, ${}^{\text{131m}}$Xe and ${}^{\text{133m}}$Xe. This paper reports on the setup, calibration and assessment of the CEA/Mirion-developed PIPSBox, used in coincidence setup with a high-purity germanium detector. The system has been configured to measure the signals from the four radionuclides of interest and demonstrates improved discrimination between signals and less interference compared to the current system. The coincident detection efficiencies are quantified through measurement of spiked radioxenon samples.

GBL15是英国获得惰性气体认证的《全面禁止核试验条约》（CTBT）放射性核素实验室，它通过使用以下方法测量环境放射性氙样品来支持国际监测系统（IMS）。 $\beta -\gamma$ 巧合光谱法。GBL15当前使用由NaI（Tl）组成的系统$\gamma$-探测器和塑料闪烁体 $\beta$-检测器，用于测量感兴趣的四种放射性氙同位素的同时发射： ${}^{\text{133}}$薛 ${}^{\text{135}}$薛 ${}^{\text{131m}}$Xe和 ${}^{\text{133m}}$薛 本文报告了CEA / Mirion开发的PIPSBox的设置，校准和评估，该盒与高纯度锗检测器的重合设置一起使用。该系统已配置为测量来自四个感兴趣的放射性核素的信号，并证明与当前系统相比，信号之间的区别得到改善，干扰更少。通过测量加标放射性氙样品来量化同时的检测效率。