双探测位置分段γ扫描系统研究

Research of Two-measurement Position Segmented Gamma Scanning System

本文以双探测位置的分段γ扫描技术为基础,建立了环放射源探测效率的理论计算方法,其能根据放射源所处的实际位置实时计算出探测效率。在此基础上研发了一套探测系统,实现了对废物桶的自动化探测。使用该系统对单个及多个60 Co和137 Cs及聚氨酯和木头组成的模拟桶进行测量。测量单个及多个放射源活度相对误差平均值分别为10%和7.9%,优于使用传统分段γ扫描技术的探测结果,最后根据测量环境估算了探测系统的最小探测限。

Based on the two‐measurement position segmented gamma scanning ,the effi‐ciency calculation method of the circular radioactivity source was deduced .According to the source position ,its detection efficiency could be calculated in time by this method . A new detection system was built on this basis ,which could automatically detect the waste drums .This system was used to measure the simulated waste drums ,which was composed of single and multiple 60Co and 137Cs in polyurethane and wood .The average relative errors of single source and multiple sources are 10% and 7.9% ,respectively . The result was better than that measured by the traditional segmented gamma scanning . At last the minimum detection limit of the system was estimated according to the meas‐urement environment .