核脉冲反演型闪烁能谱测量技术  

Scintillation energy spectrometry with nuclear pulse deconvolution

作　　者：肖无云 谢建明 李京伦 张羽中 陈晔 XIAO Wuyun;XIE Jianming;LI Jinglun;ZHANG Yuzhong;CHEN Ye(State Key Laboratory of NBC Protection for Civilian,Beijing 102205,China)

机构地区：[1]国民核生化灾害防护国家重点实验室,北京102205

出　　处：《哈尔滨工程大学学报》2022年第11期1615-1620,共6页Journal of Harbin Engineering University

基　　金：国家自然科学基金面上项目(12075318).

摘　　要：为了解决高计数率下闪烁谱仪响应变差的难题,本文采用基于卷积模型的核脉冲反演方法,实现了碘化钠探测器输出核脉冲的实时处理与幅度分析,在高计数率下实测了γ能谱,并与2种普通数字化多道进行了对比。结果表明:反演谱仪明显抑制了核脉冲堆积,在有限能量分辨率损失下,显著提升了核脉冲通过率。反演闪烁谱仪更好地平衡了核脉冲通过率与能量分辨率矛盾,在高达数十万计数每秒的脉冲通过率下综合性能优异,为不同能谱测量应用提供了更宽泛的成形参数选择空间。To address the spectral response worsening under high counting rates for scintillation spectrometers,this paper presents a nuclear pulse deconvolution method based on the convolution model that was applied to the real-time processing and amplitude analysis of the nuclear pulse output of the NaI(Tl)detector.At a high counting rate,the spectrum was measured and compared with those from two common digital multichannel analyzers.The experimental results showed that the deconvolution spectrometer significantly suppressed the pulse pile-up,remark-ably increasing the pulse throughput with a limited loss of energy resolution.Additionally,it maintained an optimal balance between the nuclear pulse throughput and energy resolution,exhibiting an excellent comprehensive high-pulse throughput of up to hundreds of kcps.Therefore,the proposed method provides a wide selection range of shaping parameters for different applications of energy spectrometry.

关 键 词：碘化钠探测器 核脉冲反演 数字信号处理 能谱测量 高计数率 脉冲通过率 能量分辨率 现场可编程门阵列 

分 类 号：TL822.4[核科学技术—核技术及应用]