通道式车辆放射性测控系统对γ放射性核素活度探测阈值的测定  

A Testing Method on Detection Threshold for Channel Vehicle Radiation Monitoring System to γ Radionuclide Activity

作　　者：何林锋[1] 唐方东[1] 滕婧静[1] 

机构地区：[1]上海市计量测试技术研究院,上海201203

出　　处：《核电子学与探测技术》2009年第4期745-747,共3页Nuclear Electronics & Detection Technology

摘　　要：论述了通道式车辆放射性测控系统对γ放射性核素活度探测阈值的测定方法。探测阈值是针对某一确定γ放射性核素而言的,表示对该核素可探测的最低活度,表征了放射性测控系统的探测能力,同时也是设置系统报警阈值的依据。探测阈值可通过探测器本底计数率的统计涨落以及对参考测量点活度响应的测量结果计算获得。对于确定的参考测量点,探测阈值与探测器本底计数率统计涨落和γ放射性核素的能谱相关。A testing method on detection threshold for channel vehicle radiation monitoring system to γ radionuclide activity was discussed. The detection threshold to certain radionuclide indicates the minimum detectable activity, which characterizes the detection ability of system as well as is the foundation for systern alarm setting. The detction threshold can be obtained by calculating the statistical fluctuation of the background of detector and the measuring results to activity response of reference point, for a certain reference point, detection threshold is related to the statistical fluctuation of the background and γ-energy spectrum.

关 键 词：通道式车辆放射性测控系统 Γ放射性核素 探测阈值 活度 活度响应 

分 类 号：TL84[核科学技术—核技术及应用] TL929