Abstract
The aim of this work is to provide the characteristics of S10985-025C MPPC arrays with an active area of 6 × 6 mm in gamma-ray spectrometry with 5 × 5×5 mm CsI:Tl scintillator over a wide temperature range (−20°C, −10°C, 0°C, +10°C, +21°C). The crystal and the MPPC array were cooled down in a cryostat with a built-in Peltier element. The measurements presented in this work covered: characteristics of breakdown voltage, selection of MPPC optimum operating voltage, verification of excess noise factor, measurement of energy resolution and the number of photoelectrons per MeV. All measurements were carried out as a function of temperature and compared with similar results obtained previously with CsI:Tl crystal coupled to the Large Area Photodiode (LAAPD).
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