Nuclear Techniques ›› 2016, Vol. 39 ›› Issue (10): 100401-100401.doi: 10.11889/j.0253-3219.2016.hjs.39.100401


Characteristics study on the APD-based front-end readout for CsI(Tl) detector

HU Lang, ZHANG Kaiqi, ZENG Guoqiang, LAI Maolin, YANG Jian, WEI Shilong   

  1. Nuclear Technology Key Laboratory of Earth Science, Chengdu University of Technology, Chengdu 610059, China
  • Received:2016-06-29 Revised:2016-08-13 Online:2016-10-10 Published:2016-10-13
  • Supported by:

    Supported by National Natural Science Foundation of China (No.41474159), Key Laboratory Foundation of Sichuan Province (No.gnzds2014006), Youth Foundation of Science Technology Department of Sichuan Province (No.2015JQO035)


Background: The avalanche photodiode (APD) has the advantages of small size, high detection efficiency, internal gain and insensitivity to magnet fields. But the internal gain and the signal-noise ratio (SNR) of the output signal of pulse are affected by bias voltage and temperature. Purpose: This study aims to test the effect of bias voltage and temperature on the APD-based front-end readout of scintillation detector. Methods: The avalanche photodiode is employed as the photodetector for CsI(Tl) scintillation, and equiped a charge sensitive preamplifier of low noise to form a probe. The energy resolution of scintillation detector with this probe was tested on a 137Cs radiation source under different bias voltage and temperature. Results: The experimental results show that the energy resolution of the detection system is affected by both the bias voltage and the temperature. When the bias voltage at both ends of the APD is 370 V, the energy resolution is 4.98% for the gamma ray with the energy of 662 keV at the room temperature. Conclusion: The energy resolution will increase with the decrease of temperature within the range of -20℃ to 40℃.

Key words: APD, CsI(Tl)scintillation crystal, Bias voltage, Temperature, Energy resolution

CLC Number: 

  • TL8