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Labr3:Ce scintillators for gamma ray spectroscopy

  • Author(s): Shah, K.S.
  • Glodo, J.
  • Klugerman, M.
  • Moses, W.W.
  • Derenzo, S.E.
  • Weber, M.J.
  • et al.
Abstract

In this paper, we report on a relatively new scintillator - LaBr3 for gamma ray spectroscopy. Crystals of this scintillator have been grown using Bridgman process. This material when doped with cerium has high light output (~;60,000 photons/MeV) and fast principal decay constant (less than 25 ns). Furthermore, it shows excellent energy resolution for gamma-ray detection. Energy resolution of 3.2 percent (FWHM) has been achieved for 662 keV photons (137Cs source) at room temperature. High timing resolution (260 ps - FWHM) has been recorded with LaBr3-PMT and BaF2-PMT detectors operating in coincidence mode using 511 keV positron annihilation gamma-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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