Comparison between Pixelated Scintillators: CsI(Tl), LaCl 3(Ce) and LYSO(Ce) when coupled to a Silicon Photomultipliers Array

A large area SiPM array is individually coupled to five different types of scintillators in and each is evaluated for the development of a coded aperture imaging system. In order to readout signals from the 144 pixel array, a resistor network with symmetric charge division circuitry was developed, which successfully provides a significant reduction in the multiplicity of the analog outputs and reduces the size of the accumulated data. Energy resolutions at 662 keV for pixelated arrays of dimensions and material types as follows: 3 × × 3 × × 20 mm 3 CsI(Tl), 4 × × 4 × × 20 mm 3 CsI(Tl), 4 × × 4 × × 5 mm 3 LYSO(Ce), 4 × × 4 × × 10 mm 3 LYSO(Ce), and 2 × × 2 × × 5 mm 3 LaCl 3 (Ce) have been determined. In addition, sub-millimeter FWHM pixel-identification resolutions were acquired from all of the scintillators tested.