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

Abstract: The aim of this work is the characterization of a ∅ 9×9mm CsI:Tl scintillator at a wide temperature range of −40°C to +22°C. A tested crystal with dimensions of ∅ 9×9mm was coupled to a 16mm 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 1MeV, the nonproportionality, the energy resolution and the intrinsic resolution were inspected with eight different peaking times – i.e., 0.6μs, 1.2μs, 2.4μs, 4.8μs, 7.2μs, 9μs, 14.4μs, 28.8μs – and discussed in terms of the light pulse shapes measured by a single photon method. [Copyright &y& Elsevier]