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Title: Comparison Between Digital and Analog Pulse Shape Discrimination Techniques for Neutron and Gamma Ray Separation

Abstract

Recent advancements in digital signal processing (DSP) using fast processors and a computer allows one to envision using it in pulse shape discrimination. In this study, we have investigated the feasibility of using a DSP to distinguish between neutrons and gamma rays by the shape of their pulses in a liquid scintillator detector (BC501). For neutron/gamma discrimination, the advantage of using a DSP over the analog method is that in an analog system, two separate charge-sensitive ADCs are required. One ADC is used to integrate the beginning of the pulse rise time while the second ADC is for integrating the tail part. In DSP techniques the incoming pulses coming directly from the detector are immediately digitized and can be decomposed into individual pulses waveforms. This eliminates the need for separate ADCs as one can easily get the integration of two parts of the pulse from the digital waveforms. This work describes the performance of these DSP techniques and compares the results with the analog method.

Authors:
Publication Date:
Research Org.:
Idaho National Laboratory (INL)
Sponsoring Org.:
USDOE
OSTI Identifier:
912417
Report Number(s):
INL/JOU-05-00924
Journal ID: ISSN 1082-3654; TRN: US0800379
DOE Contract Number:
DE-AC07-99ID-13727
Resource Type:
Journal Article
Resource Relation:
Journal Name: IEEEE Nuclear Science and Symposium - presented at conference/published on CD; Journal Issue: Paper N14-84
Country of Publication:
United States
Language:
English
Subject:
73 - NUCLEAR PHYSICS AND RADIATION PHYSICS; ANALOG SYSTEMS; COMPUTERS; LIQUID SCINTILLATORS; NEUTRONS; PERFORMANCE; PROCESSING; PULSE RISE TIME; SHAPE; WAVE FORMS

Citation Formats

Rahmat Aryaeinejad. Comparison Between Digital and Analog Pulse Shape Discrimination Techniques for Neutron and Gamma Ray Separation. United States: N. p., 2005. Web. doi:10.1109/NSSMIC.2005.1596302.
Rahmat Aryaeinejad. Comparison Between Digital and Analog Pulse Shape Discrimination Techniques for Neutron and Gamma Ray Separation. United States. doi:10.1109/NSSMIC.2005.1596302.
Rahmat Aryaeinejad. 2005. "Comparison Between Digital and Analog Pulse Shape Discrimination Techniques for Neutron and Gamma Ray Separation". United States. doi:10.1109/NSSMIC.2005.1596302.
@article{osti_912417,
title = {Comparison Between Digital and Analog Pulse Shape Discrimination Techniques for Neutron and Gamma Ray Separation},
author = {Rahmat Aryaeinejad},
abstractNote = {Recent advancements in digital signal processing (DSP) using fast processors and a computer allows one to envision using it in pulse shape discrimination. In this study, we have investigated the feasibility of using a DSP to distinguish between neutrons and gamma rays by the shape of their pulses in a liquid scintillator detector (BC501). For neutron/gamma discrimination, the advantage of using a DSP over the analog method is that in an analog system, two separate charge-sensitive ADCs are required. One ADC is used to integrate the beginning of the pulse rise time while the second ADC is for integrating the tail part. In DSP techniques the incoming pulses coming directly from the detector are immediately digitized and can be decomposed into individual pulses waveforms. This eliminates the need for separate ADCs as one can easily get the integration of two parts of the pulse from the digital waveforms. This work describes the performance of these DSP techniques and compares the results with the analog method.},
doi = {10.1109/NSSMIC.2005.1596302},
journal = {IEEEE Nuclear Science and Symposium - presented at conference/published on CD},
number = Paper N14-84,
volume = ,
place = {United States},
year = 2005,
month =
}
  • Recent advancement in digital signal processing (DSP) using fast processors and computer makes it possible to be used in pulse shape discrimination applications. In this study, we have investigated the feasibility of using a DSP to distinguish between the neutrons and gamma rays by the shape of their pulses in a liquid scintillator detector (BC501), and have investigated pulse shape-based techniques to improve the resolution performance of room-temperature cadmium zinc telluride (CZT) detectors. For the neutron/gamma discrimination, the advantage of using a DSP over the analog method is that in analog system two separate charge-sensitive ADC's are required. One ADCmore » is used to integrate the beginning of the pulse risetime while the second ADC is for integrating the tail part. Using a DSP eliminates the need for separate ADCs as one can easily get the integration of two parts of the pulse from the digital waveforms. This work describes the performance of these DSP techniques and compares the results with the analog method.« less
  • Cited by 1
  • A digital signal processor (DSP) based system is under development for analyzing and processing pulses produced by radiation detectors. The system is designed to replace conventional pulse-type, analog-to-digital converters. It is capable of capturing the complete radiation induced pulse in digital form. Subsequently, all the pulse features can be analyzed digitally (e.g., pulse validation, energy information, dynamic threshold determination, pulse duration, pulse shape analysis, and noise reduction). A prototype system has been built and performance parameters have been evaluated.
  • A digital pulse shape discrimination system (DPSD) has been used in conjunction with collimated NE213 scintillators for neutron spectroscopic measurements at high count rates (MHz range) in Joint European Torus discharges (DD and DT fueled, neutral beam injection and rf heated). The system, developed at ENEA-Frascati, is based on a commercial 200 MHz 12-bit analog to digital transient recorder card, which digitizes the direct output signal from the anode of a photomultiplier. Among the unique features of this DPSD system are the possibility of postexperiment data reprocessing, high count rate operation, and simultaneous neutron and gamma ({gamma}) spectroscopy. Separation betweenmore » {gamma} and neutron (n) events is performed by means of dedicated software exploiting the charge comparison method; separate n and {gamma} pulse height distributions are obtained and an example of neutron spectrum unfolding is shown. Implications of the DPSD in future neutron diagnostic systems on large and next step tokamaks are discussed.« less