Speaker
Description
The aim of this work is to design a camera for gamma-ray imaging based on the coded mask technique widely used in astrophysics. The Camera will be made by 16 scintillators coupled with 16 SiPMs to have an instrument lightweigth, compact for real-time analysis, with low energy consumption. We built a prototype as proof of concept using 16 CsI scintillators doped with Tl (3x3x10 cm3). Each scintillator is coupled with optical grease to a Photo-Multiplier Tube (PMT) supplied by a Cockcroft-Walton voltage multiplier (HV3020CN). The signals produced are acquired and analyzed by a CAEN digitizer (V1725). The scintillators are arranged as a 4x4 matrix and packaged in a metallic frame. We used a 7x7 mask composed by transparent and opaque tiles (PVC and tungsten 3x3x1 cm3) to encode a point source image and decode it through a reconstruction algorithm. We tested the system with different radioisotopes source placed at a distance of about 40 cm from the mask. We will present the results obtained in terms of the angular resolution on the position of the source and of the energy resolution measured with the scintillators. Then we will compare those results obtained with the PMTs replacing them with an AdvanSiD NearUV SiPM.
