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Scintillation Properties of and Self Absorption in {\rm SrI}_{2}!:!{\rm Eu}^{2+}

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4 Author(s)
Mikhail S. Alekhin ; Faculty of Applied Sciences, Delft University of Technology, The Netherlands ; Johan T. M. de Haas ; Karl W. Kramer ; Pieter Dorenbos

The scintillation properties of pure SrI2 and SrI2 doped with 0.5%, 0.86%, 2%, and 5% europium were studied. Different techniques were used to measure γ-ray excited pulse-height and scintillation decay time spectra, and to perform X-ray excited and optically excited emission spectroscopy. Eu2+ emission and trapped exciton (TE) emission was observed in SrI2:Eu2+ samples. These emissions were studied as a function of temperature, Eu concentration, and sample size. A spectral overlap was observed between Eu2+ excitation and emission spectra, the amount of overlap depends on temperature. The light yield, energy resolution and luminescence decay profiles reveal also a dependence on temperature, sample size, and Eu concentration. The observations were analyzed and interpreted in terms of two separate models. One model consists of the relation between TE and Eu2+ emission and the other deals with self absorption processes.

Published in:

IEEE Transactions on Nuclear Science  (Volume:58 ,  Issue: 5 )