用于4πβ-γ符合测量的4π多丝正比室研制  

A 4πMulti-wire Proportional Chamber for the 4πβ-γCoincidence Measurement

作　　者：杨杰[1] 张劲松[1] 储素云 王旭[1] 郭翔博 罗宁[1] 罗老永 王玮[1] 漆明森[1] YANG Jie;ZHANG Jinsong;CHU Suyun;WANG Xu;GUO Xiangbo;LUO Ning;LUO Laoyong;WANG Wei;QI Mingsen(The First Sub-institute,Nuclear Power Institute of China,Chengdu 610005,China)

机构地区：[1]中国核动力研究设计院第一研究所,成都610005

出　　处：《同位素》2023年第2期212-218,I0005,共8页Journal of Isotopes

摘　　要：4πβ-γ符合测量装置的β探测器通常为单丝结构的正比计数器,由于其电场分布呈发散状,探测面积有限,因此只能进行放射性点源的活度测量。为使4πβ-γ符合测量装置直接测量大面积放射源活度的要求,研制用作4πβ-γ符合测量装置β探测器的4π多丝正比室,并进行β坪曲线测试和本底测量。结果表明,β坪曲线的坪长约270 V,上排和下排阳极丝的坪斜分别为8.3‰和9.6‰(60 Co),8.3‰和8.9‰(90 Sr-90 Y),坪斜均在10‰以内;本底计数率均在10 s-1以内。因此,4π多丝正比室可以作为4πβ-γ符合测量装置的β探测器进行进一步的研究。Theβdetector of 4πβ-γcoincidence measurement is usually a proportional counter with a single wire of which the electric field distribution is divergent and the detection area is limited,so it can only measure the activity of the point source.A 4πmulti-wire proportional chamber used as theβdetector of 4πβ-γcoincidence measurement has been designed and fabricated because of the uniform electric field distribution and large detection area.Theβplateau curves and the background have been tested.The results show that the plateau length of theβplateau curve is about 270 V,and the plateau slope of the upper and lower anode wires are 8.3‰and 9.6‰(60 Co),8.3‰and 8.9‰(90 Sr-90 Y),respectively.The background counting rate is within 10 s-1.The 4πmulti-wire proportional chamber can be used as theβdetector of 4πβ-γcoincidence measurement for further research.

关 键 词：4π多丝正比室 4πβ-γ符合测量方法 坪曲线 β探测器 

分 类 号：TL811.2[核科学技术—核技术及应用]