Performance of FBK high-density SiPMs in scintillation spectrometry

The aim of this work is to provide the characteristics of two samples of Fondazione Bruno Kessler (FBK) high-density SiPMs with an active area of 2.2x2.2 mm super(2) (15x15 mu m super(2) single cell size) and 4x4 mm super(2) (30x30 mu m super(2) single cell size) in gamma-ray spectrometry with LSO and CsI:Tl scintillators. The measurements presented in this work covered: measurements of spectra with low number of detected photons (one to a few fired APD cells), characteristics of the breakdown voltage versus temperature, verification of the excess noise factor, selection of the optimum operating voltage for energy resolution, verification of the linearity of the SiFM response for both used scintillators, verification of the number of fired APD cells and gamma-ray spectrometry for a wide range of X and gamma ray energies from 22.1 to 1408 keV.