基于G(E)函数法的NaIγ谱仪能谱-剂量转换研究  

Study on Energy Spectrum to Dose Conversion of Nal Spectrometer Based on G(E)Function Method

作　　者：丁雪峰 孔令海 王海鹏 全葳 李扬 DING Xuefeng;KONG Linghai;WANG Haipeng;QUAN Wei;LI Yang(Nuclear and Radiation Safety Center,Beijing 102445,China;Suzhou Weimu Intelligent System Co.,Ltd,Suzhou 215000,China)

机构地区：[1]生态环境部核与辐射安全中心,北京102445 [2]苏州微木智能系统有限公司,苏州215000

出　　处：《核电子学与探测技术》2023年第4期826-830,共5页Nuclear Electronics & Detection Technology

摘　　要：利用Geant4求解国控大气辐射环境自动监测站NaIγ谱仪G(E)函数,对NaIγ谱仪进行能量响应修正,实现NaIγ谱仪能谱-剂量直接转换。通过点源刻度实验,获取NaIγ谱仪Geant4物理模型。然后利用Geant4和高斯展宽获取NaIγ谱仪对不同能量γ射线的响应能谱。最后采用最小二乘法求解得到NaIγ谱仪G(E)函数。并通过标准源^(137)Cs、^(60)Co、^(241)Am的实验能谱进行验证,表明利用G(E)函数和谱仪实际能量谱求空气吸收剂量率的方法是可行的。Geant4 was used to solve the G(E)function of Nal spectrometer in the national-controlled atmospheric radiation environment automatic monitoring station,and the energy response of Nal spectrometer was modified to achieve the direct conversion of energy spectrum to dose.Geant4 physical model of Nal spectrometer was obtained by point source calibration test.Then Geant4 and Gaussian broadening were used to obtain the response spectra of Nal spectrometer to gamma rays of different energies.Finally,the least square method was used to obtain Nal spectrometer G(E)function.The experimental energy spectra of standard source^(137)Cs,^(60)Co and^(241)Am are verified,which shows that the method of calculating the air absorbed dose rate by G(E)function and the actual energy spectrum of the spectrometer is feasible.

关 键 词：国控自动站 NAI G(E)函数 GEANT4 

分 类 号：X859[环境科学与工程—环境工程]