A novel method for investigating optically stimulated luminescence in scintillators

Mads Lykke Jensen*, Rosana Martinez Turtos, Brian Julsgaard, Volkmar Schulz, Peter Balling, Stefan Gundacker

*Corresponding author for this work

Research output: Contribution to journal/Conference contribution in journal/Contribution to newspaperJournal articleResearchpeer-review

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Abstract

Optically stimulated luminescence (OSL) is a known property in many scintillators, and investigating the branching ratio of thermalized carriers to this photon-emission mechanism could aid both scintillator development and OSL-based dosimetry. We present a novel method for determining the branching ratio of thermalized carriers to OSL in scintillators while monitoring the energy deposition from 511 keV gamma photons on an event-by-event basis. We demonstrate the method using a cerium-doped lutetium oxyorthosilicate (LYSO:Ce) crystal, and validate that the observed signal indeed originates from OSL photons by estimating the lifetime of the OSL traps, which is consistent with values found in the literature. We report a branching ratio of thermalized carriers to the OSL traps in LYSO:Ce of (1.0±0.2)% upon excitation with 511 keV gamma photons, using a one-trap-one-recombination-center model.

Original languageEnglish
Article number119237
JournalJournal of Luminescence
Volume251
ISSN0022-2313
DOIs
Publication statusPublished - Nov 2022

Keywords

  • Dosimetry
  • LYSO:Ce
  • Optically stimulated luminescence
  • Scintillation
  • Scintillator characterization

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