基于MPD-4电子学插件的液体闪烁体中子光响应特性实验研究

Experiment Study on Neutron Light Output Response for Liquid Scintillator with Electronic Module MPD-4

中子光响应函数是液体闪烁体探测器的重要参数,准确的光响应函数和探测阈值是精确确定中子探测效率的基础。近年来,专门用于液体闪烁体中子探测器的高集成度新型电子学插件(Mesytec公司的MPD-4)广泛应用于中子探测系统中,该电子学插件集成了脉冲高度(PH)、脉冲形状甄别(PSD)和恒比定时(CFD)测量功能,且1个NIM插件即可实现4路探测器的同时测量。对于同一中子探测器,利用这一电子学系统与传统电子学系统对中子的光响应函数进行了实验比对,结果表明,两套系统得到的中子光响应函数具有明显的差异。因此,在使用MPD-4电子学系统进行中子探测的实验中,需对光响应函数进行重新标定。

Neutron light output response is an important characteristic of the liquid scintillator. Accurate neutron light output response and the detection threshold can be used to determine the neutron detection efficiency. In recent years, a new highly integrated electronic module(MPD-4 of Mesytec Corp.) for liquid scintillator detector has been widely used in neutron detection system. The outputs of this module include the pulse height(PH) signal, the pulse shape discriminator(PSD) signal and the constant fraction discriminator(CFD) signal. Moreover, one NIM module can be used for four liquid scintillators at the same time. The neutron light output response obtained by the new kind of electronics was compared with that obtained by the traditional electronic system. According to the experimental results, the neutron light output responses of the two electronic systems have obvious differences. Therefore, it is necessary to measure the neutron light output response of the liquid scintillator if the MPD-4 modules are used in the neutron detection system.