用于4πβ-γ符合测量的4π多丝正比室研制

杨杰; 张劲松; 储素云; 王旭; 郭翔博; 罗宁; 罗老永; 王玮; 漆明森

doi:10.7538/tws.2022.youxian.054

用于4πβ-γ符合测量的4π多丝正比室研制

A 4π Multi-wire Proportional Chamber for the 4πβ-γ Coincidence Measurement

摘要

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‰（⁶⁰Co），8.3‰和8.9‰（⁹⁰Sr-⁹⁰Y），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。

Abstract: The β detector of 4πβ-γ coincidence 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 4π multi-wire proportional chamber used as the β detector of 4πβ-γ coincidence measurement has been designed and fabricated because of the uniform electric field distribution and large detection area. The β plateau curves and the background have been tested. The results show that the plateau length of the β plateau curve is about 270 V, and the plateau slope of the upper and lower anode wires are 8.3‰ and 9.6‰ (⁶⁰Co), 8.3‰ and 8.9‰ (⁹⁰Sr-⁹⁰Y), respectively. The background counting rate is within 10 s^-1. The 4π multiwire proportional chamber can be used as the β detector of 4πβ-γ coincidence measurement for further research.

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