混合场β/γ能谱探测器的研制  

Development of Prototype Detector for β and γ Spectra in β/γ Mixed Field

作　　者：陈立[1,2] 张庆利[1] 程建平[2] 

机构地区：[1]中国辐射防护研究院,山西太原030006 [2]清华大学工程物理系,北京100084

出　　处：《原子能科学技术》2017年第7期1296-1304,共9页Atomic Energy Science and Technology

摘　　要：为解决β/γ混合场两种射线能谱测量过程中的互相干扰问题,研制了一台含有3层闪烁晶体的叠层闪烁探测器样机,设计了脉冲形状甄别算法,实现了β/γ射线类型的甄别,并研究了同时获取两种射线能谱的方法。在^(14)C、^(36)Cl和^(90)Sr/^(90)Y 3枚β源实验中,样机将β粒子误甄别为γ的概率均小于0.1%。在^(241)Am、^(137)Cs和(60)Co 3枚γ源实验中,将γ误甄别为β的概率均低于1%。通过β/γ混合源实验,验证了样机能在粒子甄别的基础上,通过一次测量就能同时获取两种射线的能谱。To solve particle crosstalk problem in measuring spectra in aβ/γmixed field,aprototype Phoswich detector with three scintillators was developed.Theβandγwere discriminated successfully by the pulse shape discrimination algorithm developed in this work.What＇s more,the method to obtain spectra of the two rays was investigated.In theβsources（^14C,^36Cl and ^90Sr/^90Y）experiments,the probability that aβparticle was determined mistakenly as aγis not more than 0.1%.In theγsources（^241Am,^137Cs and ^60Co）experiments,the probability that aγparticle was determined mistakenly as aβis under 1%.Through experiment ofβ/γ mixed sources,it is proved that the prototype detector could discriminate the type ofβ/γand obtain spectra of the two rays respectively by only one-time measurement.

关 键 词：β/γ混合场 粒子甄别 叠层闪烁探测器 脉冲形状甄别算法 β能谱 Γ能谱 

分 类 号：TL812[核科学技术—核技术及应用]