Nuclear Techniques ›› 2020, Vol. 43 ›› Issue (5): 50401-050401.doi: 10.11889/j.0253-3219.2020.hjs.43.050401


Development of a 4π phoswich detector for measuring radioactive inert gases

Dongdong ZHOU1,2,Simei YOU1,2,Jie XIN1,2,Cuiping YANG1,2,Wanxin WEN1,2,Yue YANG1,2,Baoguo ZHANG1,2(),Rensheng WANG1,2,Ming ZHANG3   

  1. 1.State Key Laboratory of Radiation Medicine and Protection, Soochow University, Suzhou 215123, China
    2.School of Radiation Medicine and Protection, Medical College of Soochow University, Suzhou 215123, China
    3.National Institute of Metrology, Beijing 100029, China
  • Received:2020-01-13 Revised:2020-03-18 Online:2020-05-15 Published:2020-05-07
  • Contact: Baoguo ZHANG
  • About author:ZHOU Dongdong, male, born in 1991, graduated from University of South China in 2015, master student, focusing on radiation detection in medical physics
  • Supported by:
    National Key Research and Development Project(2017YFF0206205);National Natural Science Foundation of China Youth Fund Project(11605119);Jiangsu Natural Science Fund Youth Project(BK20160304);China Postdoctoral Science Foundation(2017M621818);Suzhou Science and Technology Development Plan(SZS201720);Research on Key Technologies of Nuclear Emergency and Radiation Safety(2017YFF0206206)

Abstract: 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.


This study aims to develop a set of 4π phoswich detector to accurately measure the energy spectrum of the mixed field and distinguish β-γ rays.


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.

Key words: Radioactive noble gases, 4π phoswich detector, Digital pulse processing-pulse shape discrimination, Energy calibration, β-γ discrimination

CLC Number: 

  • TL812+.1