Validation of the model of TSL isothermal decay in dosimetric α-Al2O3 crystals

• Published in: Radiation measurements 2019-03, Vol.122, p.29-33
• Main Authors: Nikiforov, S.V., Lushchik, A., Nagirnyi, V., Romet, I., Ponomareva, A.I., Ananchenko, D.V., Moiseykin, E.V.
• Format: Article
• Language: English
• Subjects: Aluminum oxide; Deep traps; Thermal ionization of F centres; Thermally stimulated luminescence; TSL build-up
• ISSN: 1350-4487; 1879-0925
• DOI: 10.1016/j.radmeas.2019.01.009

New features of isothermal build-up of thermally stimulated luminescence (TSL) related to deep traps in anion-deficient alumina single crystals are revealed. It was found that the TSL build-up at 630–750 K depends on the structure of the glow curve and is associated with the presence of a high-temperature component with Tm = 700 K. Isothermal TSL build-up for the peak at 573 K is well expressed in UV-irradiated samples and is very weak after sample irradiation by a pulsed electron beam. The TSL build-up for this peak is registered for the luminescence of F centres but is absent for the emission of F22+ centres and chromium ions. The obtained results confirm the validity of the kinetic model of the TSL build-up that takes into account the process of thermal ionization of the excited states of F centres in aluminum oxide. •Isothermal TSL build-up at 630–720 K depends on glow curve structure.•The presence of the TSL build-up at 573 K depends on type of excitation.•The TSL build-up at 573 K is measured in F centres' band only.•The TSL build-up model incorporating thermal ionization of F centres is validated.