Analog rise-time discriminator for CdZnTe detector

doi:10.1007/s41365-017-0204-0

Nuclear Science and Techniques ›› 2017, Vol. 28 ›› Issue (4): 52 doi: 10.1007/s41365-017-0204-0

• NUCLEAR ELECTRONICS AND INSTRUMENTATION • Previous Articles Next Articles

Analog rise-time discriminator for CdZnTe detector

Chuan-Hao Hu¹, Guo-Qiang Zeng¹, Liang-Quan Ge¹, Shi-Long Wei¹, Jian Yang¹, Qiang Li¹, Hong-Zhi Li²

¹Chengdu University of Technology, Chengdu 610059, China ²National Ocean Technology Center, Tianjin 300112, China

Supported by:
Supported by the Natural Science Foundation of China (NSFC) (No. 41474159), National High-tech R&D Program of China (863 Program) (Nos. 2012AA061803 and 2014AA093403) and Open Foundation of Applied Nuclear Techniques in Geosciences Key Laboratory of Sichuan Province (No. gnzds2014006).

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Chuan-Hao Hu, Guo-Qiang Zeng, Liang-Quan Ge, Shi-Long Wei, Jian Yang, Qiang Li, Hong-Zhi Li. Analog rise-time discriminator for CdZnTe detector.Nuclear Science and Techniques, 2017, 28(4): 52 doi: 10.1007/s41365-017-0204-0

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Abstract

Abstract:

Due to variable time for charge collection, energy resolution of nuclear detectors declines, especially compound semiconductor detectors 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%@662 keV, and it is still excellent under high counting rates.

Key words: Analog rise-time discriminator, CdZnTe detector, Charge comparison principle

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Analog rise-time discriminator for CdZnTe detector

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