Fast pulse sampling module for real-time neutron-gamma discrimination

Jia-Le Cai; Dao-Wu Li; Pei-Lin Wang; Zhi-Ming Zhang; Xiao-Hui Li; Bao-Tong Feng; Ting-Ting Hu; Teng Tong; Wei Zhou; Long Wei

doi:10.1007/s41365-019-0595-1

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Fast pulse sampling module for real-time neutron-gamma discrimination

NUCLEAR ELECTRONICS AND INSTRUMENTATION | Updated：2021-02-01

- Fast pulse sampling module for real-time neutron-gamma discrimination
- Nuclear Science and Techniques Vol. 30, Issue 5, Article number: 84(2019)
- Affiliations：
  
  1.Beijing Engineering Research Center of Radiographic Techniques and Equipment, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China
  2.School of Nuclear Science and Technology, University of Chinese Academy of Sciences, Beijing 100049, China
- Author bio：
  
  Corresponding author. E-mail address: weil@ihep.ac.cn
- Funds：
- DOI：10.1007/s41365-019-0595-1
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Jia-Le Cai, Dao-Wu Li, Pei-Lin Wang, et al. Fast pulse sampling module for real-time neutron-gamma discrimination. [J]. Nuclear Science and Techniques 30(5):84(2019)
DOI：

Jia-Le Cai, Dao-Wu Li, Pei-Lin Wang, et al. Fast pulse sampling module for real-time neutron-gamma discrimination. [J]. Nuclear Science and Techniques 30(5):84(2019) DOI： 10.1007/s41365-019-0595-1.

摘要

Abstract

An adaptable and compact fast pulse sampling module was developed for the neutron-gamma discrimination. The developed module is well suited for low cost and low power consumption applications. It is based on the Domino Ring Sampler 4 (DRS4) chip, which offers fast sampling speeds up to 5.12 giga samples per second (GSPS) to digitize pulses from front end detectors. The high resolution GSPS data is useful for obtaining precise real-time neutron-gamma discrimination results directly in this module. In this study, we have implemented real-time data analysis in a field programmable gate array. Real-time data analysis involves two aspects: digital waveform integral and digital pulse shape discrimination (PSD). It can significantly reduce the system dead time and data rate processed offline. Plastic scintillators (EJ-299-33), which have proven capable of PSD, were adopted as neutron detectors in the experiments. A photomultiplier tube (PMT) (model #XP2020) was coupled to one end of a detector to collect the output light from it. The pulses output from the anode of the PMT were directly passed onto the fast sampling module. The fast pulse sampling module was operated at 1 GSPS and 2 GSPS in these experiments, and the AmBe-241 source was used to examine the neutron-gamma discrimination quality. The PSD results with different sampling rates and energy thresholds were evaluated. The figure of merit (FOM) was used to describe the neutron-gamma discrimination quality. The best FOM value of 0.91 was obtained at 2 GSPS and 1 GSPS sampling rates with an energy threshold of 1.5 MeV,ee, (electron equivalent).

关键词

Keywords

Real timeNeutron-gamma discriminationDomino Ring Sampler 4Plastic scintillators

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