Characterization of CsI:Tl at a wide temperature range (-40 °C to+22 °C)

The aim of this work is the characterization of a 0 9 x 9 mm CsI:Tl scintillator at a wide temperature range of -40 degrees C to +22 degrees C. A tested crystal with dimensions of 0 9 x 9 mm was coupled to a 16 mm diameter large area Avalanche photodiode (LAAPD). The crystal and the LAAPD were cooled down in a cryostat with a built-in Peltier element. Properties such as the number of electron-hole pairs per 1 MeV, the nonproportionality, the energy resolution and the intrinsic resolution were inspected with eight different peaking times - i.e., 0.6 mu s, 1.2 mu s, 2.4 mu s, 4.8 mu s, 7.2 mu s, 9 mu s, 14.4 mu s, 28.8 mu s - and discussed in terms of the light pulse shapes measured by a single photon method. (C) 2013 Elsevier B.V. All rights reserved.