M. Danang Birowosuto, Pieter Dorenbos, G. Bizarri, Carel W. E. van Eijk, Karl W. Krämer and H. U. Güdel
Temperature Dependent Scintillation and Luminescence Characteristics of GdI₃: Ce³⁺
IEEE Trans. Nucl. Sci. 55, 1164-1169 (2008)                 

Abstract: We investigated scintillation and luminescence properties of GdI₃:1% Ce³⁺. It shows a light yield of 47000 photons/MeV recorded with a Hamamatsu R1791 photomultiplier tube (PMT). Using an Advanced Photonix 630-70-73-510 avalanche photodiode (APD), the light output of this sample is 44000 electron-hole pairs/MeV. The best energy resolution at 662 keV of 4.7% was recorded at 10°C with the APD with a shaping time of 0.5 ms. At room temperature (RT), the g-scintillation decay curve of GdI₃:1% Ce³⁺ shows a fast component of 45 ns, which is the same as the intrinsic Ce decay time, and that contributes 70% to the total light yield. GdI₃:1% Ce³⁺ shows no afterglow at RT. Temperature dependence ranging from 80 to 600 K of X-ray excited emission spectra, pulse height spectra, scintillation decay curves and optically excited decay curves of Ce³⁺ emission are also presented.