核脉冲反演型闪烁能谱测量技术

Scintillation energy spectrometry with nuclear pulse deconvolution

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.