蒙特卡罗方法在CZT探测器测量乏燃料组件燃耗中的应用

Monte Carlo Simulation of Burnup Measurement of Spent Fuel Assembly by Using CdZnTe Detector System

摘要: 利用碲锌镉（CZT）探测器组成的γ谱探测系统是一种测量乏燃料组件燃耗的较有效的方法。本文利用蒙特卡罗方法，借助于Geant4软件包计算在两种测量方式、多个准直高度条件下组件中¹³⁷Cs和¹³⁴Cs的全能峰探测效率，对测量结果的正确评价分析具有一定意义。另外，采用偏倚抽样方法确定源粒子发射方向，极大提高了CZT探测器全能峰探测效率。

Abstract: The γ spectrum detecting system with CdZnTe (CZT) detector is one of effective methods for burnup measurement of spent fuel assembly. The detector efficiencies of the full energy peak for¹³⁷Cs and ¹³⁴Cs were calculated with Geant4. The direction biasing sample method of source particle was used to improve calculation efficiency. The results provide a theoretical guide for the further burnup measurement.