摘要
本文研究了Cs_(2)LiYCl_(6):Ce^(3+)(CLYC)晶体对21 MeV质子的响应特性及其与中子、γ射线的波形甄别能力。实验利用串列加速器产生质子,结合Am-Be中子源和^(137)Cs、^(60)Coγ源,采集了三种粒子在CLYC晶体中产生的波形。采用电荷比较法进行数字化波形分析,通过优化积分时间窗口,实现了质子与中子(品质因子Figure of Merit,FOM=1.86)、质子与γ(FOM=1.0)以及质子、中子与γ混合场(中子/γFOM=2.0,质子/中子FOM=1.54,质子/γFOM=1.45)的有效甄别。研究结果表明,CLYC晶体中质子事件的闪烁波形包含芯能级发光(Core-tovalence Luminescence,CVL)、Ce^(3+)发光、V_(k)中心发光和自捕获受激发射(Self-trapped Stimulated Emission,STE)4种成分,其中,CVL成分衰减时间约为3.8 ns。该研究证实CLYC晶体具备同时对质子、中子和γ射线进行探测与识别的能力,为其在空间辐射探测等复杂环境中的应用提供了重要依据。
[Background]Cs_(2)LiYCl_(6):Ce^(3+)(CLYC)is a promising inorganic scintillator with excellent neutron/gamma pulse shape discrimination capability.[Purpose]This study aims to investigate the response characteristics of Cs_(2)LiYCl_(6):Ce^(3+)(CLYC)crystals to 21 MeV protons and their pulse shape discrimination(PSD)capability for protons,neutrons,and gamma rays.[Methods]Digital waveforms generated by proton irradiation from a tandem accelerator,alongside neutrons from an Am-Be source and gamma rays from^(137)Cs and^(60)Co sources,were acquired.Then,the charge comparison method with optimized integration time windows was employed to achieve effective discrimination between proton and neutron events with figure of merit(FOM)of 1.86,between proton and gamma events with FOM of 1.0,and in a mixed field of protons,neutrons,and gamma rays with FOM of 2.0 for neutron/gamma,1.54 for proton/neutron,and 1.45 for proton/gamma.[Results]The experimental results indicate that the scintillation pulse shape induced by protons in CLYC crystals comprises four decay components:core-to-valence luminescence(CVL,~3.8 ns),Ce^(3+)-related emission,V_(k)center-related emission,and self-trapped stimulated emission(STE).[Conclusions]Results of this study confirm the capability of CLYC crystals for simultaneous detection and discrimination of protons,neutrons,and gamma rays,supporting their potential application in complex radiation environments such as space radiation detection.
作者
许浒
张祥林
何寻社
胡光
刘朋波
杨中中
朱伟峰
XU Hu;ZHANG Xianglin;HE Xunshe;HU Guang;LIU Pengbo;YANG Zhongzhong;ZHU Weifeng(Xi'an Jiaotong University,Xi'an 710049,China;Shaanxi Weifeng Instrument Inc.,Xi'an 710075,China)
出处
《核技术》
2026年第4期82-89,共8页
Nuclear Techniques
基金
陕西省重点研发项目(No.2024PT-ZCK-78)资助。
关键词
CLYC晶体
波形甄别
电荷比较法
质子
中子
CLYC crystal
Pulse shape discrimination
Charge comparison method
Proton
Neutron
