Nuclear Techniques ›› 2020, Vol. 43 ›› Issue (5): 50402-050402.doi: 10.11889/j.0253-3219.2020.hjs.43.050402

• NUCLEAR ELECTRONICS AND INSTRUMENTATION • Previous Articles     Next Articles

Detector design and performance test for coded camera of large area and high sensitivity

Yan LI1,2,Qiang WANG1,2,Xianchao HUANG2,Lei SHUAI2,Daquan CAO2,Yiwen ZHANG2,Yao YANG2,3,Xuanhou HU2,Xiuzuo LIANG2,3,Jun WU1,2,Guoqiang ZENG1,Zhiming ZHANG2,3()   

  1. 1.College of Nuclear Technology and Automation Engineering, Chengdu University of Technology, Chengdu 610059, China
    2.Beijing Engineering Research Center of Radiographic Techniques and Equipment, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China
    3.School of Nuclear Science and Technology, University of Chinese Academy of Sciences, Beijing 100049, China
  • Received:2019-11-09 Revised:2020-03-23 Online:2020-05-15 Published:2020-05-07
  • Contact: Zhiming ZHANG E-mail:zhangzhm@ihep.ac.cn
  • About author:LI Yan, male, born in 1994, graduated from Chengdu University of Technology, master student, focusing on nuclear electronics and radiation detection research
  • Supported by:
    Frontier Technology Research and Equipment Development for Nuclear Safety Monitoring(ZDRW-CN-2018-1)

Abstract: Background

The traditional gamma camera cannot locate the contaminated area of nuclear accident, and cannot obtain the information of the contaminated area and degree in real time.

Purpose

This study aims to develop a coded aperture gamma camera detector system with large area and high sensitivity.

Methods

A detector module of large area CsI (Tl) crystal array coupled with photomultiplier tube array was proposed. It consisted of 121 CsI (Tl) crystals at the size of 15 mm×15 mm×15 mm, and 2×2 array composed of 4 detector modules was taken as γ camera detector. Multi-channel readout electronics composed of amplification, filter shaping and single-to-differential conversion circuit was independently designed for readout processing of detector signals. Finally, the performance of this detector system was evaluated by experimental tests.

Results

The results indicate that the detector module can achieve the position resolution, and its average energy resolution is 9.4% under the excitation of 662 keV γ-ray.

Conclusions

The detector system can satisfied the design requirements of coded aperture γ camera of high sensitivity in terms of position resolution, energy resolution, uniformity of peak position and detection efficiency.

Key words: Position sensitive detector, CsI(Tl) crystal array, Photo multiplier tube, Coded-aperture γ camera

CLC Number: 

  • TL99