辐射防护2026，Vol.46Issue(1)：1-9,9.
基于单光电倍增管液闪计数器的缪子信号符合消除方法研究
Study on the method of eliminating muon signals by coincidence technique based on a single photomultiplier liquid scintillation counter
张鹏鹏 1李德源 1王林靖 1张宣汝 1加德拉·库阿尼别克 1李华1
作者信息
- 1. 中国辐射防护研究院 核药研发转化与精准防护山西省重点实验室,太原 030006
- 折叠
摘要
Abstract
As a radioactive nuclide activity detection technique with advantages such as high sensitivity,high detection efficiency,and simple operation,liquid scintillation measurement is widely used for measuring the activity of low-energy nuclides(e.g.,14 C,3 H,and 55 Fe)in samples from the atmosphere,water bodies,soil,and biological specimens.During the measurement process,interference from background events(e.g.,muons)leads to inflated results,thereby affecting the final analysis.To address the above problem,this paper proposes a dual-channel signal coincidence method to eliminate muon signals from background events.This method leverages the favorable signal time-preserving characteristics of fast-response photomultiplier tubes(PMTs).It marks the β signal output from the last dynode of the fast-response PMT and applies coincidence rejection to the muon signal.The marked β signal controls the switching of a gate,enabling the gating of the β signal output from the PMT anode.Experimental verification was conducted using 14 C liquid scintillation samples.The results show a significant difference in the decay times between muon signals and β signals.The typical decay time for muon signals is 154.4 ns,while for β signals it is 41.6 ns.Specifically,muon signal decay times exceed 80 ns,whereas β signal decay times fall within the 10～80 ns range.The proposed method effectively eliminates muon signals.This research can serve as a reference for the accurate measurement of portable low-energy β nuclide activity.关键词
液闪测量技术/低能核素/缪子/符合法Key words
liquid scintillation measurement technique/low-energy nuclides/muon/coincidence method分类
能源科技引用本文复制引用
张鹏鹏,李德源,王林靖,张宣汝,加德拉·库阿尼别克,李华..基于单光电倍增管液闪计数器的缪子信号符合消除方法研究[J].辐射防护,2026,46(1):1-9,9.
