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discrimination of neutrons and gamma rays in plastic scintillator based on pulse-coupled neural network

nuclear Science and Techniques 2021年第8期32卷 48-56页

作者： Hao-Ran Liu Yu-Xin Cheng Zhuo Zuo Tian-Tian Sun Kai-Min Wang The Engineering&Technical College of Chengdu University of Technology Leshan 614000China Southwestern Institute of Physics Chengdu 610225China

neutron and gamma ray pulse signal discrimination technology is an essential part of many modern scientific fields,such as biology,geology,radiation imaging,and nuclear *** are always accompanied by gamma rays due to their unique penetration characteristic;thus,the development of n-γdiscrimination methods is especially *** the present study,a novel n-γdiscrimination method is proposed that implements a pulse-coupled neural network for n-γ*** addition,experiments were conducted on the pulse signals detected by an EJ299-33 plastic scintillator,which is especially suitable for n-γ*** proposed method was compared to three other discrimination methods,including the back-propagation neural network(BPnn),the fractal spectrum method,and the charge comparison method,with respect to two aspects:(i)the figure of merit(FoM)and(ii)discrimination *** experimental results showed that the pulse-coupled neural network(PCnn)has a 26.49%improvement in FoM-value compared to the charge comparison method,a72.80%improvement compared to the BPnn,a 66.24%improvement compared to the fractal spectrum method,and the second-fastest discrimination time of 2.22 *** conclusion,the PCnn treats the input signal as a whole for analysis and processing,imparting it with an excellent antinoise effect and the ability to process the dynamic information contained in a pulse signal.

关键词： Pulse-coupled neural network Charge comparison Back-propagation neural network Fractal spectrum n-γdiscrimination

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Performance of real‑time neutron/gamma discrimination methods

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nuclear Science and Techniques 2023年第1期34卷 102-110页

作者： Shi‑Xing Liu Wei Zhang Zi‑Han Zhang Shuang Lin Hong‑Rui Cao Cheng‑Xin Song Jin‑Long Zhao Guo‑Qiang Zhong School of Electronics Hefei University of TechnologyHefei 230009China China nuclear Power Engineering Co. LtdBeijing 100840China Institute of Plasma Physics Hefei Institutes of Physical ScienceChinese Academy of SciencesHefei 230031China

nuclear security usually requires the simultaneous detection of neutrons and gamma *** the development of crystalline materials in recent years,Cs2LiLaBr6(CLLB)dual-readout detectors have attracted extensive attention from researchers,where real-time neutron/gamma pulse discrimination is the critical factor among detector performance *** study investigated the discrimination performance of the charge comparison,amplitude comparison,time comparison,and pulse gradient_(m)ethods and the effects of a Sallen–Key filter on their *** results show that the figure of merit(FOM)of all four methods is improved by proper *** them,the charge comparison method exhibits excellent noise resistance;moreover,it is the most_(s)uitable method of real-time discrimination for CLLB ***,its discrimination performance depends on the parameters t_(s),t_(m),and t_(e).When t_(s)corresponds to the moment at which the pulse is at 10%of its peak value,t_(e)requires a delay of only 640–740 ns compared to t_(s),at which time the potentially optimal FOM of the charge comparison method at 3.1–3.3 MeV is greater than *** FOM obtained using the t_(m)value calculated by a proposed maximized discrimination difference model(MDDM)and the potentially optimal FOM differ by less than 3.9%,indicating that the model can provide good guidance for parameter selection in the charge comparison method.

关键词： Charge comparison Maximized discrimination difference model Pulse filtering Real time n-γdiscrimination

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Compact MPPC-based coded aperture imaging camera for dual-particle detection

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Radiation Detection Technology and Methods 2021年第1期5卷 61-70页

作者： Jing Guo Xiaoyu Pang Jiale Cai Daowu Li Xiaoming Wang Xuanhou Hu Yue Yu Shuangquan Liu Xiuzuo Liang Yiwen Zhang Lei Shuai Long Wei Beijing Engineering Research Center of Radiographic Techniques and Equipment Institute of High Energy PhysicsChinese Academy of SciencesBeijing 100049China School of nuclear Science and Technology University of Chinese Academy of SciencesBeijing 100049China Jinan Laboratory of Applied nuclear Science Jinan 250131China

Purpose Fast neutrons and gamma-ray imaging detection is an effective way to detect and identify radioactive material in the field of nuclear security.A compact coded aperture imaging(CAI)camera was designed to be sensitive to both gamma and neutron radiation based on plastic scintillators and multi-pixel photon counters(MPPC).Methods MPPCs coupling with the 13×13 pixelated plastic scintillators one-to-one were utilized to reduce the scale of the CAI system while maintaining good positional *** symmetric charge division(SCD)circuit was adopted to reduce the 169 signals output from the MPPC array to *** waveform was collected and processed with four Domino Ring Sampler 4(DRS4)chips and two 16-channel analog-to-digital converter(ADC)*** the pulse shapes of fast neutrons would be broadened after elastic scattering multiple times in the scintillators,the Anger-Logic method was applied to eliminate multiple elastic scattering events so that good pulse shape discrimination(PSD)performance can be *** The imaging and detection ability of the camerawas evaluated using the 241Am-Be(5.9×10^(5) n/s)neutron source and 137Cs(370 MBq)*** camera can be used to detect fast neutrons(0.5–10 MeV)and gammarays(0.2–2.5MeV).Furthermore,it can implement efficient neutron/gamma PSD capabilities in the mixed-field *** figure of merit(FOM)of the camera calculated at 400keVee energy cut is *** A compact MPPC-based CAI camera was designed to detect and discriminate fast neutrons and gamma *** good PSD performance was well suited to distinguish fast neutrons from gamma rays in a dual-particle *** portable design makes it promising for complex monitoring scenarios in nuclear security.

关键词： Coded aperture imaging Fast neutron imaging Gamma imaging n-γdiscrimination

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