环境水样自动监测装置的效率标定及Monte Carlo模拟  

Monte Carlo simulation and efficiency calibration of a Ce-137 monitoring system for environmental water samples

作　　者：潘孝兵[1] 全林[1] 余小任[1] 曲广卫 王少舜 

机构地区：[1]西北核技术研究所,西安710024 [2]陕西卫峰核电子有限公司,西安710118

出　　处：《核技术》2012年第1期37-40,共4页Nuclear Techniques

摘　　要：为获得自动取样监测装置中的NaI(Tl)探测器对于低水平环境水样中人工放射性核素137Cs比活度,对NaI(Tl)探测器γ能谱响应进行了实验标定与Monte Carlo模拟,分别模拟了探测器对137Cs点源的能谱响应,探测器置于铅室内137Cs溶液中央的能谱响应。探测效率与峰总比的模拟计算结果与实际值基本一致。结果表明,利用经较高比活度实验结果验证的MC计算模型,可校正低活度水平环境水样的测量值,为在线监测方法的建立提供了技术支持。For 137Cs monitoring in environmental water samples, a NaI（T1） system consisting the detector and a lead chamber containing Cs solution of different concentrations was used for Monte Carlo simulation and experimental calibration on ）,-ray spectrum response of the NaI（T1） detector. The spectrum response of a point source was simulated. The detector was placed in an SS glove and immerged in the 137Cs solution. The results show that the MC model verified by high specific activities can be used to calibrate the detector system for environmental water samples of low activity levels. This method provides technical support for online monitoring of 137Cs.

关 键 词：蒙特卡罗 NaI(T1)探测器 137Cs 环境水样监测 

分 类 号：P631[天文地球—地质矿产勘探]