<EM>β</EM>-<EM>γ</EM>符合法测量放射性氙同位素记忆效应研究

β-γ符合法测量放射性氙同位素记忆效应研究

摘要: β-γ符合法是全面禁止核试验条约（CTBT）放射性核素核查中测量放射性惰性气体氙的一种重要方法。文章主要介绍了β-γ符合法测量放射性氙同位素活度时塑料闪烁体探测器的惰性气体记忆效应，实验测量了记忆效应及其对探测器最小可探测活度（MDA）的影响，在此基础上，探讨了减小惰性气体记忆效应的方法。结果表明，镀铝薄膜塑料闪烁体和YAP闪烁体可显著减小惰性气体记忆效应。

Abstract: The β-γ coincidence technique is a kind of the key important method to detect radioactive xenon isotopes for the Comprehensive Nuclear-Test-Ban Treaty (CTBT). This paper describes noble gases memory effects of β-γ coincidence detector. Xenon memory effects were measured and its influence on detector’s minimum detectable activity (MDA) was evaluated. The methods of reducing xenon memory effects were studied. In conclusion, aluminium coated plastic scintillator and YAP scintillator can remarkably decrease xenon memory effects.