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Open Access Publications from the University of California

LaCl{sub 3}:Ce scintillator for Gamma ray detection

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

In this paper, we report on a relatively new cerium doped scintillator - LaCl3 for gamma ray spectroscopy. Crystals of this scintillator have been grown using Bridgman method. This material when doped with 10% cerium has high light output (~50,000 photons/MeV) and fast principal decay time constant (~20 ns). Furthermore, it shows excellent energy resolution for gamma ray detection. For example, energy resolution as low as 3.2% (FWHM) has been achieved with 662 keV photons (137Cs source) at room temperature. Also high timing resolution (264 ps - FWHM) has been recorded with LaCl3-PMT and BaF2-PMT detectors operating in coincidence using 511 keV positron annihilation gamma ray pairs. Details of crystal growth, scintillation properties, and variation of these properties with cerium concentration are also reported.

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