基于溴化镧探测器的γ射线空气吸收剂量率的测量方法  

The measurement method of gamma ray air absorbed dose rate based on LaBr_(3)(Ce) detector

作　　者：曹勤剑[1] 夏三强 贺萌 刘立业[1] 肖运实[1] 李晓敦 焦岩 CAO Qinjian;XIA Sanqiang;HE Meng;LLU Liye;XIAO Yunshi;LI Xiaodun;JIAO Yan(China Institution for Radiation Protection,Taiyuan 030006 China;China Nuclear Power Engineering Co.,Ltd,Beijing 100840 China)

机构地区：[1]中国辐射防护研究院,山西太原030006 [2]中国核电工程有限公司,北京100840

出　　处：《中国辐射卫生》2021年第2期154-158,共5页Chinese Journal of Radiological Health

摘　　要：目的针对溴化镧闪烁体探测器,开展了G(E)函数的计算方法研究,最终实现了空气吸收剂量率的测量。方法首先,基于蒙特卡罗模拟计算方法,模拟计算出溴化镧探测器的γ能谱,给出不同能量的响应函数;然后,利用最小二乘法计算得到了G(E)函数;最后,利用标准点源实验,将溴化镧探测器利用G(E)函数转换测量得到的空气吸收剂量率与理论计算值进行了比较。结果实验验证结果表明,基于G(E)函数得到的空气吸收剂量率与理论计算值的相对偏差控制在±6%以内,验证了G(E)函数的准确性。结论基于γ谱-剂量转换方法,就地γ谱仪可应用于辐射剂量的测量。Objective Based on the lanthanum bromide scintillator detector,the calculation method of G(E)function was developed to measure the air absorbed dose rate.Methods Firstly,the gamma energy spectrumof the lanthanum bromide detector were simulated and the response functions with different energies were determined with Monte Carlo simulation method.Then,the G(E)function was calculated by the least square method.Finally,the air absorbed dose rate measured by the lanthanum bromide detector using G(E)function conversion method was compared with the theoretical calculation value based on the point source experiments.Results The experimental verification results showed that the relative deviation between thecalculated value with G(E)function and the theoretical calculation value wasmostly controlled within±6%,which verified the accuracy of G(E)function.Conclusion The results showed that the method of G(E)function could be applied to calculate the gamma radiation dose rate based on the in-situ the gamma spectrum with LaBr3 detector.

关 键 词：溴化镧探测器 能谱剂量转换函数 就地Γ谱仪 

分 类 号：R144.1[医药卫生—公共卫生与预防医学]