BC537探测器中γ射线的响应函数测量与蒙特卡罗模拟  

γ-ray response function measurements and Monte-Carlo simulation of BC537 liquid scintillator

作　　者：冯松[1] 陈小辉[1] 刘荣[1] 羊奕伟[1,2] 鹿心鑫[1] 朱通华[1] 

机构地区：[1]中国工程物理研究院核物理与化学研究所,四川绵阳621900 [2]清华大学工程物理系,北京100084

出　　处：《强激光与粒子束》2014年第5期222-227,共6页High Power Laser and Particle Beams

基　　金：国家自然科学基金项目(91226104)

摘　　要：为了将氘化液闪探测器(BC537)测量的反冲电子谱转换为γ射线能谱,利用标准γ点源对BC537探测器的响应进行了测量并运用基于蒙特卡罗方法的Geant4程序计算了BC537探测器探测γ射线的响应函数。讨论了探测器建模中有无铝壳和入射γ射线束流半径对探测效率和响应函数的影响。对比模拟和实验测量的反冲电子谱,两者符合较好。利用模拟的响应函数和实验测量标准γ源Cs-137和Co-60以及AmBe源在BC537探测器中的反冲电子谱,经迭代法解谱得到了对应的标准γ射线能谱,验证了模拟参数的合理性以及该响应函数的实用性。In order to unlold the measured recoil electron spectrum generated by gamma ray m a deuterated hquld scintilla- tor, standard gamma sources were used to measure the γ-ray response of BC537 detector and the 7 ray response function for the BC537 detector was calculated by Geant4 codes which was based on the Monte-Carlo method. The effects of the aluminum con- tainer and the beam radius on the detection efficiency were investigated as a function of the beam energy by Geant4 simulation. The simulated response function shows a good agreement with the experimental data at different energies. With the response function and the recoil electron spectrum of three reference γ-ray sources, an iterative unfolding algorithm was used to unfold the 7-ray spectrum, and the results further verify the practicability of the simulated response function.

关 键 词：响应函数 蒙特卡罗方法 氘化液闪探测器 迭代法 解谱 

分 类 号：TL812[核科学技术—核技术及应用]