中子场往往伴随着来自于中子源自身放出的或中子与屏蔽材料以及周围环境反应放出的光子,而有机闪烁体探测器型中子谱仪对于中子和光子同样敏感,因此必须考虑10 MeV以内光子的影响。BC501A型探测器光电倍增管的输出存在270 ns的慢成分和30 ns的快成分,慢成分会随次级带电粒子阻止本领的增加而增加,可用来通过脉冲形状实现粒子甄别。使用快速采样示波器进行数据采集,采用非线性牛顿最小二乘法拟合进行数据分析。同时考虑 The neutron field is often accompanied by photons emitted by the neutron source itself or emitted by the neutron-shielding material and the surrounding environment, whereas the organic scintillator detector-type neutron spectrometer is equally sensitive to neutrons and photons and must therefore be considered Photons within 10 MeV. The output of the BC501A photomultiplier tube has a slow component of 270 ns and a fast component of 30 ns. The slow component increases with the blocking power of the secondary charged particles and can be used to discriminate particles by pulse shape. Data acquisition was performed using a fast sampling oscilloscope and data was analyzed using a non-linear Newton-least squares fit. consider