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Promising Alkaline Earth Halide Scintillators for Gamma-Ray Spectroscopy

Author:
Shirwadkar, U.   Hawrami, R.   Glodo, J.   van Loef, E. V. D.   Shah, K. S.  


Journal:
IEEE Transactions on Nuclear Science


Issue Date:
2013


Abstract(summary):

Up to 1-in-diameter, Eu-doped CsBa2I5 and BaBrI crystals have been grown using the vertical Bridgman method. Scintillation properties of the crystals up to similar to 1 x 1 x cm(3) have been studied under gamma-ray irradiation. Systematic concentration studies have been performed for both these alkaline earth halides with Eu2+ doping levels ranging from 0% to 10% to optimize growth of large crystals. We have achieved excellent energy resolution of similar to 2.6% at 662 keV for a 2 x 2 x 1-mm(3) sample of CsBa2I5:2% Eu. However, in this paper, the emphasis is on the larger crystals that can be used practically in nuclear nonproliferation applications. Our measurements of a 1.0 x 1.0 x 1.0-cm(3) sample of CsBa2I5:3% Eu, processed from a 1-in-diameter crystal, shows very good energy resolution of 3.9% at 662 keV, high light output of similar to 80 000 photons/MeV, and a principal decay time of similar to 900 ns. The second investigated composition, BaBrI:5% Eu, 1.0-cm-diameter x 1.0-cm-thick sample shows high light output of 71 000 photons/MeV and energy resolution of 4.3% at 662 keV. A decay time of 480 ns was measured for this sample, which is shorter than most Eu2+ doped materials of this size. The emission in these materials is due to d -> f transitions of Eu2+ and occurs over a single band between 400-500 nm. It peaks at similar to 430 nm for CsBa2I5:Eu and at similar to 413 nm for BaBrI: Eu. Since both compositions show high proportionality over a wide range of energies, we expect to see improvements in the energy resolution of large crystals, as better quality of 1-in-diameter crystals are grown.


Page:
1011-1015


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