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A digital method for the discrimination of neutrons and γ rays with organic scintillation detectors using frequency gradient analysis.

Liu, Guofu and Joyce, Malcolm J. and Ma, Xiandong and Aspinall, Michael (2010) A digital method for the discrimination of neutrons and γ rays with organic scintillation detectors using frequency gradient analysis. IEEE Transactions on Nuclear Science, 57 (3). 1682 -1691. ISSN 0018-9499

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    A digital method for the discrimination of neutron and γ-ray events from an organic scintillator has been investigated by using frequency gradient analysis (FGA) based on the Fourier transform. Since the scintillation process and the photomultiplier tube (PMT) anode signal are often very noisy, most pulse-shape discrimination methods in a scintillation detection system (e.g., the charge comparison (CC) method or pulse gradient analysis (PGA)) using time-domain features of the signal depend greatly on the associated de-noising algorithm. In this research, the performance of the new FGA method and the PGA method have been studied and compared on a theoretical basis and then verified by time-of-flight (TOF). The frequency-domain features extracted by the FGA method exhibit a strong insensitivity to the variation in pulse response of the photomultiplier tube (PMT) and can be used to discriminate neutron and γ-ray events in a mixed radiation field. It is shown that the FGA method results in an increased figure of merit (FOM) which corresponds to a reduction in the area of overlap between neutron and γ-ray events. The FGA method has the potential to be implemented in current embedded electronic systems to provide real-time discrimination in standalone instruments.

    Item Type: Article
    Journal or Publication Title: IEEE Transactions on Nuclear Science
    Additional Information: "©2010 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE." "This material is presented to ensure timely dissemination of scholarly and technical work. Copyright and all rights therein are retained by authors or by other copyright holders. All persons copying this information are expected to adhere to the terms and constraints invoked by each author's copyright. In most cases, these works may not be reposted without the explicit permission of the copyright holder."
    Uncontrolled Keywords: γ rays ; digital discrimination ; frequency gradient analysis ; neutron ; organic scintillators ; pulse gradient analysis ; time of flight
    Subjects: T Technology > TK Electrical engineering. Electronics Nuclear engineering
    Departments: Faculty of Science and Technology > Engineering
    ID Code: 34852
    Deposited By: Dr Xiandong Ma
    Deposited On: 13 Dec 2010 16:31
    Refereed?: Yes
    Published?: Published
    Last Modified: 21 Sep 2017 03:52
    Identification Number:

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