MC法创建(LaBr_3:Ce^(3+))探测器能谱-剂量转换G(E)函数  

Study on G(E) Function of the (LaBr_3:Ce^(3+)) Detector by Monte Carlo Method

作　　者：邓中华[1,2] 王媛 赵永生[1,2] 钟丁生 DENG Zhong-hua;WANG Yuan;ZHAO Yong-sheng;ZHONG Ding-sheng(The Engineering and Technical College of Chengdu University of Technology,Leshan Sichuan 614000,China;Southwestern Institute of Physics,Chengdu 610041,China;Leshan Vocational and Technical College,Leshan Siehnan 614000,China)

机构地区：[1]成都理工大学工程技术学院,四川乐山614000 [2]核工业西南物理研究院,成都610041 [3]乐山职业技术学院,四川乐山614000

出　　处：《核电子学与探测技术》2018年第3期441-444,共4页Nuclear Electronics & Detection Technology

基　　金：成都理工大学工程计术学院青年基金(C122016011)资助

摘　　要：G(E)函数法是通过软件来调整仪器能量响应,实现脉冲幅度谱到剂量率转换的一种方法。本文提出了φ38.1 mm×38.1 mm的(LaBr_3:Ce^(3+))探测器能谱-剂量转换G(E)函数的计算方法。利用MCNP分别模拟了对应的响应能谱,并将其作为标准谱求解得到G(E)函数。采用G(E)函数计算三种γ射线标准源在距探测器轴线5 cm处的剂量率值。利用γ射线在空气中的吸收剂量率计算式得到三种标准源剂量率理论值,与上述G(E)函数剂量率值相比较,相对误差在12.82%以内。G(E)function is a method that can adjust instrument energy response using software,and can obtain dose rate from the pulse amplitude spetra.This paper presents a method for calculating G (E) function of the lanthanum bromide detector (LaBr3:Ce^3+)by using MCNP.The simulating spetra was regarded as the standard spectrum to calculate G (E).And then,he dose rate at 5 cm from the detector axis were determined by using G(E)function.Meanwhile,the air absorbed dose rates were calculated by using the theoretical formula.Finally,we compared the above date ,which indicates that the relative error is less than 12.82% and the scheme is feasible.

关 键 词：(LaBr3:Ce^3+) G(E)函数 剂量率 最小二乘法 

分 类 号：TL81[核科学技术—核技术及应用]