CsI(Na)闪烁薄膜对重带电粒子时间响应实验研究

Experimental Study on Time Characteristic of CsI(Na) Scintillation Film under Heavy Charged Particle Excitation

摘要: 为发展具有粒子甄别能力的空间带电粒子辐射场测量的闪烁探测技术，本文采用单光子计数方法测量了片状CsI(Na)晶体在质子、锂离子和氧离子激发下的衰减时间曲线，结合CsI(Na)对脉冲X射线瞬态响应的波形分析，结果表明，CsI(Na)晶体对质子、重带电粒子和电子展示出完全不同的衰减时间特征。基于CsI(Na)材料的闪烁探测器在电流型计数模式下可望实现对高能电子、质子和重离子的分辨，从而为其用于空间辐射场测量的信号波形甄别奠定基础。

Abstract: To develop a type of scintillation detector for space charged particle radiation with particle discriminating ability, the decay time curve of CsI(Na) film irradiated with proton, Li and O ions was measured using the single photon counting method. Combining with the waveform of CsI(Na) excited by pulsed X-ray, it is found that CsI(Na) films show totally different time response to proton, heavy ions and electrons. High energy electrons, proton and heavy charged particles can be discriminated by their pulse shapes measured by scintillation detector in current counting mode. Therefore it lays a foundation for applying this kind of detector to discriminating signal waveform of space radiation detection.