Abstract
The Muon Portal Project aims at the construction of alarge volume detector to inspect the content of travelling containers forthe identification of high-Z hidden materials (U, Pu or other fissilesamples), exploiting the secondary cosmic-ray muon radiation. An image ofthese materials is achieved reconstructing the deviations of the muons fromtheir original trajectories inside the detector volume, by means of twoparticle trackers, placed one below and one above the container. The scan isperformed without adding any external radiation, in a few minutes and with ahigh spatial and angular resolution. The detector consists of 4800scintillating strips with two wavelength shifting (WLS) fibers inside eachstrip, coupled to Silicon photomultipliers (SiPMs). A smart strategy for theread out system allows a considerable reduction of the number of theread-out channels. Actually, an intense measurement campaign is in progressto carefully characterize any single component of the detector. A prototypeof one of the 48 detection modules (1 × 3 m2) is actually underconstruction. This paper presents the detector architecture and thepreliminary results.
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