用Fisher线性判别方法甄别Cs_2LiYCl_6:Ce~(3+)晶体的n/γ波形

Cs_2LiYCl_6:Ce~(3+)(CLYC)晶体是一种性能优异的无机闪烁晶体,具有良好的n/γ脉冲形状甄别能力。传统的电荷比较法常用来甄别CLYC晶体的n/γ,通过优化积分时间窗口的宽度来获得最优的甄别结果,计算量大。本文提出利用Fisher线性判别进行CLYC晶体的n/γ波形甄别,以获得高甄别品质因子为准则来构建投影向量。n/γ混合场由Am-Be源产生,用泰科DPO7104示波器记录探测器信号。结果表明,构建投影向量后,Fisher线性判别方法计算量小、可移植性强,且可得到优于电荷比较法的甄别结果。

n/γ Pulse Shape Discrimination in Cs2 LiYCl6 :Ce3+ Crystal Using Fisher Linear Discriminant

Cs2LiYCl6:Ce3+ (CLYC) crystal is a promising new inorganic scintillator .It can discriminate neutron and γ rays with pulse shape discrimination (PSD ) method . Charge comparison method ,whose best discrimination result was achieved through opti-mizing the integral time window width with heavy calculation ,was usually adopted to discriminate neutron and γ rays in CLYC .In this work ,Fisher linear discriminant , w hich aims to get high discrimination figure of merit through constructing projective vector ,was used to discriminate neutron and γin CLYC crystal in Am-Be mixed radia-tion field .The signals from CLYC crystal were digitized using DPO 7104 oscilloscope . The results show that after constructing projective vector ,Fisher linear discriminant hassmall calculation and good robustness ,and can get better discrimination results than charge comparison method .