Correlation between thermoluminescence and optically stimulated luminescence responses of natural alexandrite

N.M. Trindade a b, M.R. Cruz b, E.M. Yoshimura b

 

Highlights

  • Alexandrite has shown to be a promising mineral for dosimetry.
  • The OSL signals of the sliced alexandrite sample increase linearity with the dose from 1 to 5 Gy.
  • The first in-depth investigation of correlation between TL and OSL of natural alexandrite.
  • The emission of the OSL signal is closely related to the emptying of the trap related to the main TL peak.

Abstract

Luminescent properties of alexandrite crystals (BeAl2O4:Cr3+) are studied. Partial readouts of thermoluminescence (TL) and optically stimulated luminescence (OSL) signals were obtained to infer the relations of OSL and TL trapping centers. Four TL peaks were studied; their intensities decrease at different rates by illumination with blue OSL light. The OSL curve shows two-time components (exponential decay constants 3.15 and 28.4 s). The short time component is preferentially diminished when the sample is heated to temperatures from 363 to 513 K. About 50% of the whole TL intensity remains after a complete 300s OSL readout.

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