摘要
本文在实验的基础上建立了实验模型,确立了光电倍增管与闪烁体的最佳结构位置,对探测器结构进行了优化设计;同时制作了复合塑料闪烁体,得出喷涂对联三苯的最佳质量厚度为10～11 mg/cm^2,ZnS(Ag)涂层的最佳质量厚度为5～7 mg/cm^2;最后加工制作了样机,并对样机进行了性能测试。结果表明:样机灵敏探测面积为170 cm^2,α射线探测效率为28.4%,探测下限为0.06 Bq/cm^2,β射线探测效率为52.5%,探测下限为0.03 Bq/cm^2,可以满足正常监测和事故情况下的α/β表面污染监测要求。
In this paper,an experimental model was established based on the experiments,and the optimal structure position of the photomultiplier tube and the scintillator was established.The structure of the detector was optimized.At the same time,a composite plastic scintillator was produced and obtained that the best mass thickness of the p-terphenyls coating is 10~11 mg/cm^2,and the best mass thickness of the ZnS (Ag)coating is 5~7 mg/cm^2 through the experiment.Finally,a prototype machine was fabricated and the prototype was tested for performance.The results show that the sensitive detection area of the prototype is 170 cm^2,the detection efficiency of α-ray is 28.4%,the detection limit is 0.06 Bq/cm^2,the detection efficiency of β-ray is 52.5%,and the detection limit is 0.03 Bq/cm^2,which can meet the requirements of the α/β surface contamination monitoring under the conditions of normal monitoring and accidents.
作者
段再煜
李洋
谷铁男
刘翠红
DUAN Zai-yu;LI Yang;GU Tie-nan;LIU Cui-hong(Department of Engineering Physics,Tsinghua University,Beijing 100084,China;Unit 92609,Beijing 100077,China)
出处
《核电子学与探测技术》
CAS
北大核心
2018年第5期599-603,共5页
Nuclear Electronics & Detection Technology
关键词
表面污染仪
光学系统
探测效率
surface contamination meter
optical system
detection efficiency
