γ-ray response function measurements and Monte-Carlo simulation of BC537 liquid scintillator
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摘要: 为了将氘化液闪探测器(BC537)测量的反冲电子谱转换为射线能谱, 利用标准点源对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探测器探测射线的响应函数。讨论了探测器建模中有无铝壳和入射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源Cs-137和Co-60以及Am-Be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。Abstract: In order to unfold the measured recoil electron spectrum generated by gamma ray in a deuterated liquid scintillator, standard gamma sources were used to measure the -ray response of BC537 detector and the -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 container 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 -ray sources, an iterative unfolding algorithm was used to unfold the -ray spectrum, and the results further verify the practicability of the simulated response function.
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