使用单能X射线辐射装置对CdTe探测效率的实验刻度  

Experimental Calibration of CdTe Detection Efficiency Using Single-energy X-ray Radiation Device

作　　者：余涛[1,2] 郭思明 周建斌[1] 蒋政[1,2] 郄晓雨 郭锴悦 吴金杰 YU Tao;GUO Si-ming;ZHOU Jiang-bin;JIANG Zheng;QIE Xiao-yu;GUO Kai-yue;WU Jing-jie(Chengdu University of Technology,Chengdu,Sichuan 610059,China;National Institute of Metrology,Beijing 100029,China;Hebei University of Science and Technology,Shijiazhuang,Hebei 050018,China;China Jiliang University,Hangzhou,Zhejiang 310018,China)

机构地区：[1]成都理工大学,四川成都610059 [2]中国计量科学研究院,北京100029 [3]河北科技大学,河北石家庄050018 [4]中国计量大学,浙江杭州310018

出　　处：《计量学报》2022年第10期1366-1370,共5页Acta Metrologica Sinica

基　　金：中国计量科学研究院基本科研业务费(AKYZZ2115)。

摘　　要：CdTe探测器对单能平行光子源的绝对测量之前,需要进行效率刻度。利用MCNP5蒙特卡罗模拟程序建立CdTe探测器物理模型,模拟计算了10~260 keV能量段能点的本征探测效率,在10~60 keV能量段探测效率高于75%。用单能X射线装置和HPGe探测器对CdTe探测器本征探测效率进行了实验刻度。结果表明,在10~100 keV能量范围内CdTe探测器的模拟效率与实验效率趋势一致,最大误差不超过5.6%。因为Te元素在27 keV和32 keV处会产生逃逸峰,导致探测效率在这2个能量处有明显下降趋势。用^(241)Am和^(133)Ba放射源对CdTe探测器进行效率刻度验证,在能量为59.54 keV和81 keV放射源标定的探测效率与单能X射线辐射装置测量值相符。Before realizing the absolute measurement of the single-energy parallel photon source,it is necessary to calibrate the efficiency of the CdTe detector.The physical model of the CdTe detector was established by using the MCNP5 Monte Carlo simulation program,the intrinsic detection efficiency of the energy point in the 10~260 keV energy range was simulated and calculated,the detection efficiency was higher than 75%in the energy range of 10~60 keV.The intrinsic detection efficiency of the CdTe detector was experimentally calibrated with a single energy X-ray device and a HPGe detector.The results show that the simulated efficiency of the CdTe detector is consistent with the experimental efficiency trend in the energy range of 10~100 keV,and the maximum error does not exceed 5.6%.Because the Te element produces escape peaks at 27 keV and 32 keV,the detection efficiency has a clear downward trend at these two energies.Efficiency calibration of CdTe detector was carried out with ^(241)Am and ^(133)Ba radioactive sources,and the calibration efficiency of radioactive sources with energies of 59.54 keV and 81 keV was consistent with the measured value of single energy X-ray radiation device.

关 键 词：计量学 CdTe探测器 本征探测效率 蒙特卡罗 探测效率刻度 

分 类 号：TB98[一般工业技术—计量学]