Scalable gamma-ray camera for wide-area search based on silicon photomultipliers array.

摘要: Portable coded-aperture imaging systems based on scintillators and semiconductors have found use in a variety of radiological applications. For stand-off detection weakly emitting materials, large volume detectors can facilitate the rapid localization materials. We describe scalable system 5.02 × cm2 CsI(Tl) scintillator modules, each partitioned into 4 20 mm3 pixels that are optically coupled to 12 pixel silicon photo-multiplier (SiPM) arrays. The 144 per module read-out with resistor-based charge-division circuit reduces readout outputs from four signals module, which interaction position total deposited energy be extracted. All readily distinguishable an average resolution, at 662 keV, 13.7% FWHM, peak-to-valley ratio 8.2, peak-to-Compton 2.9. detector is composed SiPM array 2 cm thick modified uniformly redundant mask. image reconstruction, cross correlation maximum likelihood expectation maximization methods used. shows field view 45° angular resolution 4.7° FWHM.