Nuclear Techniques ›› 2020, Vol. 43 ›› Issue (1): 10203-010203.doi: 10.11889/j.0253-3219.2020.hjs.43.010203


Study of the detection unit of the calorimeter for the next generation Compton telescope

Wufeng LIU1,Xiangman LIU1,2(),Shuwen TANG2,3(),Zhiyu SUN2,3,Yuhong YU2,3,Wei WANG4,5,Ruofu CHEN2,3,Fang FANG2,Junling CHEN2,Duo YAN2,Yongjie ZHANG2,3,Shitao WANG2,3,Xueheng ZHANG2,3,Ke YUE2,3,Jianwei LU1,Bingqian ZHOU2,3,Yixuan ZHAO2,3   

  1. 1. College of Electrical Engineering, Henan University of Technology, Zhengzhou 450001, China
    2. Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China
    3. School of Nuclear Science and Technology, University of Chinese Academy of Sciences, Beijing 100049, China
    4. School of Physics and Technology, Wuhan University, Wuhan 430072, China
    5. Wuhan University-National Astronomical Observatories Joint Center for Astronomy, Wuhan 430072, China
  • Received:2019-10-24 Revised:2019-12-10 Online:2020-01-15 Published:2020-01-21
  • Contact: Xiangman LIU,Shuwen TANG;
  • About author:LIU Wufeng, male, born in 1983, graduated from Graduate University of Chinese Academy of Sciences with a doctoral student in 2009, focusing on accelerator control, intelligent control, data acquisition, detector technology, etc
  • Supported by:
    Scientific and Technological Project of Henan Province(172102210028);Key Scientific Research Project for Universities of Henan Province(17A490001);Youth Backbone Teacher Project of Colleges and Universities of Henan Province(2016GGJS-066);Special Funds for Basic Scientific Research Business Expenses of Universities and Colleges(2017RCJH12);National Natural Science Foundation of China

Abstract: Background

Compared with other energy regions, little research of gamma-ray astronomy in the MeV energy region has been carried out, hence insufficient exploration of astrophysical information is available in the MeV energy region.


This study aims to investigate the gamma-ray astronomy of MeV energy region so as to provide reference for the design of the next generation Compton telescope calorimeter.


A dual-ended readout gamma-ray detector was designed as the elementary detection unit of a calorimeter. The detector was made of a long CsI(Tl) bar with the size of 10 mm×10 mm×80 mm and wrapped by the ESR film. The photodiode (PD), the avalanche photodiode (APD) and the silicon photomultiplier tube (SiPM) were used respectively as photoelectric converters for the detector, and they were tested by using 137Cs source at different positions on the detector.


The results show that the total energy and interaction position of the incident gamma-ray can be determined by reading the signal amplitudes at two ends of the three photoelectric converters. The energy resolution for 662 keV gamma-ray is 5.9% (full width at half maxima, FWHM) and the position resolution is about 5.7 mm (FWHM), which is the best performance obtained in the case of SiPM readout.


The detection unit designed in this paper can meet the performance requirements of the calorimeter of the next generation Compton telescope.

Key words: Calorimeter, Dual-ended readout, CsI(Tl) crystal, Energy resolution, Position resolution

CLC Number: 

  • TL812+.1