A real-time peak-detection approach for nuclear detection and its implementation on an FPGA  

作　　者：Yao Yang Daowu Li Yan Li Jipeng Zhang Tingting Hu Yan Li Long Wei 

机构地区：[1]Beijing Engineering Research Center of Radiographic Techniques and Equipment,Institute of High Energy Physics,Chinese Academy of Sciences,Beijing 100049,China [2]School of Nuclear Science and Technology,University of Chinese Academy of Sciences,Beijing 100049,China [3]The College of Nuclear Technology and Automation Engineering,Chengdu University of Technology,Chengdu 610059,China

出　　处：《Radiation Detection Technology and Methods》2020年第2期161-173,共13页辐射探测技术与方法（英文）

基　　金：This work is supported by the Instrument Developing Project of the Chinese Academy of Sciences Grant 29201707。

摘　　要：Introduction Detecting a pulse correctly is a key process in nuclear detection.Because the radiation emission is a random process,it is hard to design a suitable peak-detection approach in FPGA.The error detection will influence the final energy spectrum and flood histogram.In order to improve the result of nuclear detection,this paper proposes a novel method for nuclear signal peak-detection,which can improve both the effective counting rate and the quality of pulses in real-time.Methods The main method is to establish a normalized reference pulse regardless of waveform through the least squares method.By calculating the loss between the incoming data stream and normalized reference pulse,this algorithm retains the pulses whose loss is below the threshold.We select the threshold based on statistical methods.The algorithm is implemented on field programmable gate array(FPGA)successfully,and this process is able to work in real-time.Conclusion The result shows that the effective counting rate can improve about 19.8%and more than 99%pile-up and error pulses will be suppressed.By analyzing reserved pulses,the energy spectrum and flood histogram could be well rectified.The energy resolution increases 11%compared with traditional algorithm.Furthermore,due to this new algorithm,the low-energy threshold can be lower.

关 键 词：Least square method Peak detection Pulse pile-up(PPU) Real-time calculation FPGA 

分 类 号：TL81[核科学技术—核技术及应用]