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High energy resolution scintillation spectrometers

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6 Author(s)
Shah, K.S. ; Radiat. Monitoring Devices Inc., Watertown, MA, USA ; Glodo, J. ; Klugerman, M. ; Higgins, W.
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We report on cerium doped scintillator - LaBr3:Ce for gamma ray spectroscopy. Crystals of this scintillator have been grown using the Bridgman process. This material when doped with cerium has high light output (>60,000 photons/MeV) and fast principal decay constant (<30 ns). The peak of LaBr3:Ce emission is at 360 nm. LaBr3:Ce shows excellent energy resolution for gamma ray detection. For 662 keV gamma rays (137Cs source), energy resolution of 2.7% (FWHM) has been recorded at room temperature for LaBr3:Ce crystals coupled to a photomultiplier. This energy resolution is over two times better than that of NaI(TI) scintillators. Analysis of the energy resolution of LaBr3:Ce scintillators is presented and the performance of this scintillator at other gamma ray energies is covered. Energy resolution of LaBr3:Ce crystals coupled to silicon avalanche photodiodes is discussed. Potential applications of this material are addressed.

Published in:

Nuclear Science Symposium Conference Record, 2003 IEEE  (Volume:5 )

Date of Conference:

19-25 Oct. 2003

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