摘要
核电场所产生的放射性惰性气体辐射场主要为β-γ混合场,叠层探测器具有良好的β-γ甄别能力。为了测量放射性惰性气体,研制了一套4π叠层探测器。该叠层探测器主要是由内层侧壁厚度为1 mm的中空圆柱形塑料闪烁体EJ-200,外叠加一层侧壁厚度为20 mm的碘化铯闪烁体CsI(Tl)组成的探头,两个圆柱底面用硅油耦合光电倍增管(Photomultiplier Tube,PMT),使用意大利CAEN公司的DT5790波形数字采样器和DPP-PSD(Digital Pulse Processing-Pulse Shape Discrimination)控制探头输出信号的获取和处理,后端使用ROOT和MATLAB软件对获取结果进行处理。通过使用133Ba和137Cs放射源对该探测器进行标定刻度,实现了β-γ信号甄别,表明该4π叠层探测器具备测量放射性惰性气体的能力。
[Background]The radiation field of the radioactive inert gas generated in a nuclear power station is mainly β-γ mixed field.The phoswich detector has good ability to discriminate β and γ rays.[Purpose]This study aims to develop a set of 4πphoswich detector to accurately measure the energy spectrum of the mixed field and distinguishβ-γrays.[Methods]The phoswich detector mainly consisted of a hollow cylindrical plastic scintillator EJ-200 with layer thickness of 1 mm and a cesium iodide scintillator CsI(Tl)with side wall thickness of 20 mm overlay on the outer layer of EJ200.The two photomultiplier tubes(PMT)were placed at both end surfaces of the cylinder respectively,and coupled by using silicone oil.The DT5790 dual digital pulse shape analyzer of CAEN company and the digital pulse processing-pulse shape discrimination(DPP-PSD)were used to obtain the detector output signals,and results were processed by ROOT and MATLAB software.Finally the detector was calibrated by use 133Ba and 137Cs radiation sources.[Results&Conclusions]The β-γ signal discrimination is realized by mathematical methods in back end computer software,indicating that the detector is capable of measuring radioactive inert gas.
作者
周冬冬
尤思梅
辛杰
杨翠萍
文万信
杨悦
张保国
王仁生
张明
ZHOU Dongdong;YOU Simei;XIN Jie;YANG Cuiping;WENWanxin;YANG Yue;ZHANG Baoguo;WANG Rensheng;ZHANG Ming(State Key Laboratory of Radiation Medicine and Protection,Soochow University,Suzhou 215123,China;School of Radiation Medicine and Protection,Medical College of Soochow University,Suzhou 215123,China;National Institute of Metrology,Beijing 100029,China)
出处
《核技术》
CAS
CSCD
北大核心
2020年第5期24-30,共7页
Nuclear Techniques
基金
国家重点研发计划(No.2017YFF0206205)
国家自然科学基金青年基金项目(No.11605119)
江苏省自然科学基金青年项目(No.BK20160304)
国家博后基金面上项目(No.2017M621818)
苏州市科技发展计划(科技设施)项目(No.SZS201720)
核应急与辐射安全关键计量技术研究(No.2017YFF0206206)资助。
关键词
放射性惰性气体
4π
叠层探测器
波形数字采样器
能量刻度
β-γ
甄别
Radioactive noble gases
4πphoswich detector
Digital pulse processing-pulse shape discrimination
Energy calibration
β-γdiscrimination
