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muon radiography technology for detecting high-Z materials

Chinese Physics C 2010年第5期34卷 610-614页

作者：马玲玲王文昕周建荣孙少华刘作业李露杜洪川张小东胡碧涛 School of Nuclear Science and Technology Lanzhou University

This paper studies the possibility of using the scattering of cosmic muons to identify threatening high-Z materials. Various scenarios of threat material detection are simulated with the Geant4 toolkit. PoCA （Point of Closest Approach） algorithm reconstructing muon track gives 3D radiography images of the target material. Z-discrimination capability, effects of the placement of high-Z materials, shielding materials inside the cargo, and spatial resolution of position sensitive detector for muon radiography are carefully studied. Our results show that a detector position resolution of 50 μm is good enough for shielded materials detection.

关键词： cosmic ray muons muon radiography PoCA algorithm high-Z materials multiple scattering

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Imaging internal density structure of the Laoheishan volcanic cone with cosmic ray muon radiography

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Nuclear Science and Techniques 2022年第7期33卷 115-124页

作者： Ya-Ping Cheng Ran Han Zhi-Wei Li Jing-Tai Li Xin Mao Wen-Qiang Dou Xin-Zhuo Feng Xiao-Ping Ou-Yang Bin Liao Fang Liu Lei Huang Science and Technology on Reliability and Environmental Engineering Laboratory Beijing Institute of Spacecraft Environment EngineeringBeijing100094China School of Nuclear Science and Engineering North China Electric Power University2 BeiNong RoadBeijing102206China College of nuclear science and technology Beijing Normal University19 Xinjiekou outer St.Beijing100875China Aerospace Information Research Institute Chinese Academy of Sciences9 Dengzhuang South RoadBeijing100094China

muon radiography is a promising technique for imaging the internal density structures of targets such as tunnels,pyramids,and volcanoes up to a scale of a few hundred meters by measuring the flux attenuation of cosmic ray muons after they have traveled through these *** this study,we conducted experimental muon radiography of one of the volcanoes in the Wudalianchi area in Northeast China to image its internal density *** muon detector used in this study was composed of plastic scintillators and silicon *** approximately one and a half months of observing the crater and conduit of the Laoheishan volcano cone in Wudalianchi from September 23^(rd) to November 10^(th) 2019,more than 3 million muon tracks fulfilling the data selection criteria were *** on the muon samples and high-resolution topography obtained through aerial photogrammetry using an unmanned aerial vehicle,a density image of the Laoheishan volcano cone was *** results obtained in this experiment demonstrate the feasibility of using a radiography technique based on plastic scintillator *** obtain the density distribution,we performed a detailed background analysis and found that low-energy charged particles dominated the background *** higher densities were found near the surface of the volcanic cone,whereas relatively lower densities were found near the center of the volcanic *** experiment in this study is the first volcano muon tomography study performed in *** work provides an important reference for future research.

关键词： muon radiography muon transmission imaging Density

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Imaging Algorithms for Cosmic Ray muon radiography Detection of Nuclear Materials

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Tsinghua Science and Technology 2009年第3期14卷 313-321页

作者：刘圆圆陈志强赵自然张丽王振天 Department of Engineering Physics Tsinghua University Beijing 100084 China Key Laboratory of Particle and Radiation Imaging Ministry of EducationBeijing 100084 China

Cosmic ray muon radiography which has good penetration ability and is sensitive to high-Z materials, is an effective method to detect shielded nuclear materials. This paper summarizes methods developed to process muon radiography in Tsinghua University. The methods include detector data correction, reconstruction algorithms （maximum likelihood scattering, MLS, and the maximum likelihood scattering and displacement, MLSD） acceleration, and the modification of the normalized mean absolute distance measure （NMADM） into a picture comparison binarization method （PCBM） which is more suitable for cosmic ray muon radiographs. Simulations demonstrate that all these methods give excellent results, so that cosmic muon radiography can become more widely used.

关键词： muon radiography simulation data correction reconstruction algorithm picture comparison

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