The penetrating ability of cosmic ray muons makes them an attractive probefor imaging dense materials. Here, we describe experimental results from a newtechnique that uses neutrons generated by cosmic-ray muons to identify thepresence of special nuclear material (SNM). Neutrons emitted from SNM are usedto tag muon-induced fission events in actinides and laminography is used toform images of the stopping material. This technique allows the imaging ofSNM-bearing objects tagged using muon tracking detectors located above or tothe side of the objects, and may have potential applications in warheadverification scenarios. During the experiment described here we did not attemptto distinguish the type or grade of the SNM.
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