放射性氙同位素β-γ符合能谱分析方法

Analysis Method for Beta-Gamma Coincidence Spectra from Radioxenon Isotopes

放射性氙同位素监测是国际禁核试核查的重要手段,其测量方法主要有HPGeγ能谱测量和β-γ符合测量两种。论文阐述了采用β-γ符合技术获取的三维β-γ符合能谱数据的分析流程及方法,对符合能谱的感兴趣区(ROI)、干扰因素扣除的原理及方法进行了详细分析,最后给出了放射性氙同位素活度浓度及最小可探测活度浓度(MDC)计算公式。通过对三维β-γ符合能谱数据分析原理的研究,可为β-γ符合测量系统分析软件的设计提供依据。

Radioxenon isotopes monitoring is one important method for the verification of CTBT, what includes the measurement methods of HPGe γ spectrometer and β - γ coincidence. The article describes the analytic flowchart and method of three - dimensional beta - gamma coincidence spectra from β - γ systems, and analyses in detail the principles and methods of the regions of interest of coincidence spectra and subtracting the interference, finally gives the formula of radioactivity of Xenon isotopes and minimum detectable concentrations. Studying on the principles of three - dimensional beta - gamma coincidence spectra, which can supply the foun- dation for designing the software of β -γcoincidence systems.