Digital discrimination of neutrons and γ rays with organic scintillation detectors in an 8-bit sampling system using frequency gradient analysis

YANG Jun; LUO Xiao-Liang; LIU Guo-Fu; LIN Cun-Bao; WANG Yan-Ling; HU Qing-Qing; PENG Jin-Xian

doi:10.1088/1674-1137/36/6/011

Chinese Physics C> 2012, Vol. 36> Issue(6) : 544-551 DOI: 10.1088/1674-1137/36/6/011

Digital discrimination of neutrons and γ rays with organic scintillation detectors in an 8-bit sampling system using frequency gradient analysis

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The feasibility of using frequency gradient analysis (FGA), a digital method based on Fourier transform, to discriminate neutrons and γ rays in the environment of an 8-bit sampling system has been investigated. The performances of most pulse shape discrimination methods in a scintillation detection system using the time-domain features of the photomultiplier tube anode signal will be lower or non-effective in this low resolution sampling system. However, the FGA method using the frequency-domain features of the anode signal exhibits a strong insensitivity to noise and can be used to discriminate neutrons and γ rays in the above sampling system. A detailed study of the quality of the FGA method in BC501A liquid scintillators is presented using a 5 G samples/s 8-bit oscilloscope and a 14.1 MeV neutron generator. A comparison of the discrimination results of the time-of-flight and conventional charge comparison (CC) methods proves the applicability of this technique. Moreover, FGA has the potential to be implemented in current embedded electronics systems to provide real-time discrimination in standalone instruments.

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YANG Jun, LUO Xiao-Liang, LIU Guo-Fu, LIN Cun-Bao, WANG Yan-Ling, HU Qing-Qing and PENG Jin-Xian. Digital discrimination of neutrons and γ rays with organic scintillation detectors in an 8-bit sampling system using frequency gradient analysis[J]. Chinese Physics C, 2012, 36(6): 544-551. doi: 10.1088/1674-1137/36/6/011

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Received: 2011-10-08
Revised: 1900-01-01

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沈阳化工大学材料科学与工程学院沈阳 110142

Digital discrimination of neutrons and γ rays with organic scintillation detectors in an 8-bit sampling system using frequency gradient analysis

Corresponding author: LUO Xiao-Liang,

Received Date: 2011-10-08
Accepted Date: 1900-01-01
Available Online: 2012-06-05

Abstract: The feasibility of using frequency gradient analysis (FGA), a digital method based on Fourier transform, to discriminate neutrons and γ rays in the environment of an 8-bit sampling system has been investigated. The performances of most pulse shape discrimination methods in a scintillation detection system using the time-domain features of the photomultiplier tube anode signal will be lower or non-effective in this low resolution sampling system. However, the FGA method using the frequency-domain features of the anode signal exhibits a strong insensitivity to noise and can be used to discriminate neutrons and γ rays in the above sampling system. A detailed study of the quality of the FGA method in BC501A liquid scintillators is presented using a 5 G samples/s 8-bit oscilloscope and a 14.1 MeV neutron generator. A comparison of the discrimination results of the time-of-flight and conventional charge comparison (CC) methods proves the applicability of this technique. Moreover, FGA has the potential to be implemented in current embedded electronics systems to provide real-time discrimination in standalone instruments.