Nuclear Science and Techniques ›› 2019, Vol. 42 ›› Issue (4): 40401-040401.doi: 10.11889/j.0253-3219.2019.hjs.42.040401

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Design and simulation study of an online activity measuring detector for radioactive noble gases

Yiqiu LI1,2,Cuiping YANG1,2,Baoguo ZHANG1,2,Ming ZHANG3,Wanxin WEN1,2,Rensheng WANG1,2()   

  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:2018-12-19 Revised:2019-01-25 Online:2019-04-10 Published:2019-04-18
  • Contact: Rensheng WANG E-mail:wrs16@suda.edu.cn
  • About author:<named-content content-type="corresp-name">LI Yiqiu</named-content>, male, born in 1993, graduated from Xuzhou Medical University in 2016, master student, focusing on radiation detection in medical physics|<named-content content-type="corresp-name">LI Yiqiu</named-content>, male, born in 1993, graduated from Xuzhou Medical University in 2016, master student, focusing on radiation detection in medical physics|WANG Rensheng, E-mail: <email>wrs16@suda.edu.cn</email>
  • Supported by:
    Supported by National Key Research and Development Project (No.2017YFF0206205, No.2017YFF0206206), National Natural Science Fund Youth Fund Project (No.11605119, No.11705190), Jiangsu Natural Science Fund Youth Project (No.BK20160304), China Postdoctoral Science Foundation(No.2017M621818)

Abstract: Background

In normal operation or emergency, nuclear reactor can produce radioactive noble gases, the main components are 85Kr, 133Xe, 135Xe and 41Ar. It is of great significance to monitor the radioactivity of these mixed noble gases accurately for the operation of nuclear power plant.

Purpose

This study aims to develop a 4π phoswich scintillator detector to measure the radioactivity of noble gases in online model.

Methods

The 4π phoswich scintillator detector consists of a sampling chamber, an inner plastic scintillator chamber for β measurement, and a CsI scintillator chamber for γ measurement. The pulse shaping discrimination (PSD) method is developed to distinguish the events between β, γ and β-γ coincidence events. Based on GEANT4 simulation toolkit, the performance of the detector, including the detection efficiency is investigated.

Results

The simulation results show that both 0.3 mm plastic scintillator layer and a 20 mm CsI layer are necessary for measuring the radioactivity of noble gases. The size of sampling chamber should not be larger than ?50 mm×50 mm. Under these conditions, the detection efficiency for the above nuclides can be up to 90%.

Conclusions

According to the simulation results, a composed 2-layer scintillation detector is designed, and its detection and recognition capability for different inert gases is studied. The comparison of these characteristics with actual calibration is the crucial step for this device.

Key words: Radioactive noble gases, Radioactivity measurement, 4π phoswich scintillator detector, β-γ coincidence, GEANT4

CLC Number: 

  • O613.1,TL812+.1