基于NaI(TI)探测器的车载水质放射性探测系统可行性

The Feasibility of Vehicle Borne Radioactive Detection System Based on NaI(TI)Detector

为了研制基于NaI(TI)探测器的车载水质放射性探测系统,优化探测系统结构,节约成本,利用蒙特卡罗方法模拟计算程序Geant4对不同体积的水箱探测器全能峰探测效率和全能峰计数进行模拟计算。效率刻度后,实验测量得到的全能峰探测效率和全能峰计数与蒙特卡罗模拟计算结果特征相同。将国防科工局一级站制备的比活度为10Bq/L ^(137)Cs标准溶液放置在车载检测系统中进行实验,分析探测器的性能参数,如检测时间、探测限、比活度和相对误差之间的关系。结果表明,系统的探测性能满足课题要求。在核事故发生时,车载水质放射性探测系统可以迅速到达指定检测区域,并进行快速定量检测,可为管理部门迅速做出应对措施提供帮助。

A radioactive detection system for water on the vehicle based on NaI(TI)detector was developed.In order to optimize the structure of the detection system and to save the cost,the Monte Carlo code Geant4 was used to simulate the detection efficiency and the peak value of the detector when the holders with different volume were used in the detection system.After efficiency calibration,the detection efficiency of actual measurement for all-around peak count were similar with the results from Monte Carlo simulation results.To further understand the relationship between the relative error and the performance parameters of the detector,such as detection time,detection limit and the activity,the 10 Bq/L ^(137)Cs standard solution that was prepared by the State Administration of Science.Technology and Industry for National Defence.PRC was placed in detection system on the vehicle for experiment.The detection performance ofsystem satisfied the requirement of subject index requirement.In the event of a nuclear accident,we need quickly reach the designated test area and conduct rapid quantitative testing which can provide the basis for the rapid response of the management department.