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

作　　者：杨俊 罗晓亮 刘国富 林存宝 王艳玲 胡青青 彭进先 

机构地区：[1]Department of Instrument Science and Technology,National University of Defense Technology

出　　处：《Chinese Physics C》2012年第6期544-551,共8页中国物理C（英文版）

基　　金：Supported by National Natural Science Foundation of China (A050508/11175254)

摘　　要：The feasibility of using frequency gradient analysis （FGA）, a digital method based on Fourier transform, to discriminate neutrons and T 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 ~/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.The feasibility of using frequency gradient analysis （FGA）, a digital method based on Fourier transform, to discriminate neutrons and T 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 ~/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.

关 键 词：n-y discrimination liquid scintillator FGA 8-bit sampling system 

分 类 号：TL812[核科学技术—核技术及应用]