Analog rise-time discriminator for CdZnTe detector

Chuan-Hao Hu; Guo-Qiang Zeng; Liang-Quan Ge; Shi-Long Wei; Jian Yang; Qiang Li; Hong-Zhi Li

doi:10.1007/s41365-017-0204-0

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Analog rise-time discriminator for CdZnTe detector

NUCLEAR ELECTRONICS AND INSTRUMENTATION | Updated：2021-02-23

- Analog rise-time discriminator for CdZnTe detector
- Nuclear Science and Techniques Vol. 28, Issue 4, Article number: 52(2017)
- Affiliations：
  
  1.Chengdu University of Technology, Chengdu 610059, China
  2.National Ocean Technology Center, Tianjin 300112, China
- Author bio：
  
  Guo-Qiang Zeng zgq@cdut.edu.cn
- Funds：
- DOI：10.1007/s41365-017-0204-0
  CLC：
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Chuan-Hao Hu, Guo-Qiang Zeng, Liang-Quan Ge, et al. Analog rise-time discriminator for CdZnTe detector. [J]. Nuclear Science and Techniques 28(4):52(2017)
DOI：

Chuan-Hao Hu, Guo-Qiang Zeng, Liang-Quan Ge, et al. Analog rise-time discriminator for CdZnTe detector. [J]. Nuclear Science and Techniques 28(4):52(2017) DOI： 10.1007/s41365-017-0204-0.

摘要

Abstract

Due to variable time for charge collection, energy resolution of nuclear detectors declines, especially compound semiconductordetectors like cadmium zinc telluride (CdZnTe) detector,. To solve this problem, an analog rise-time discriminator based on charge comparison principle is designed. The reference charge signal after attenuation is compared with the deconvoluted and delayed current signal. It is found that the amplitude of delayed current signal is higher than that of the reference charge signal when rise time of the input signal is shorter than the discrimination time, thus generating gating signal and triggering DMCA (digital multi-channel analyzer) to receive the total integral charge signal. When rise time of the input signal is longer than discrimination time, DMCA remains inactivated and the corresponding total integral charge signal is abandoned. Test results show that combination of the designed rise-time discriminator and DMCA can reduce hole tailing of CdZnTe detector significantly. Energy resolution of the system is 0.98%@662keV and it is still excellent under high counting rates.

关键词

Keywords

Analog rise-time discriminatorCdZnTe detectorCharge comparison principle

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Special Class for the Gifted Young , University of Science and Technology of China

Department of Modern Physics, University of Science and Technology of China

Shanghai Institute of Applied Physics, the Chinese Academy of Sciences

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