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LaBr3:Ce scintillators for gamma-ray spectroscopy

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6 Author(s)
Shah, K.S. ; Radiat. Monitoring Devices Inc., Watertown, MA, USA ; Glodo, J. ; Klugerman, M. ; Moses, W.W.
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In this paper, we report on a relatively new scintillator - LaBr3:Ce for gamma-ray spectroscopy. Crystals of this scintillator have been grown using Bridgman process. This material when doped with cerium has high light output (∼60000 photons/MeV) and fast principal decay constant (≤25 ns). Furthermore, it shows excellent energy resolution for γ-ray detection. Energy resolution of 3.2% (FWHM) has been achieved for 662 keV photons (137Cs source) at room temperature. High timing resolution (260 ps FWHM) has been recorded with LaBr3:Ce-PMT and BaF2-PMT detectors operating in coincidence mode using 511-keV positron annihilation γ-ray pairs. Details of its scintillation properties, and variation of these properties with changing cerium concentration are reported. Potential applications of this material are also addressed.

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Nuclear Science, IEEE Transactions on  (Volume:50 ,  Issue: 6 )