TL, OSL, and phototransferred TL in beta-irradiated anion-defective Al2O3

摘要

The behavior of TL, OSL and PTTL under thermal and/or optical stimulation in beta-irradiated alpha-Al2O3 was investigated. The noticeable change of the shape of the main TL peak after thermal or optical stimulation clearly shows that this peak is related to at least two traps. The OSL curves recorded after preheating up to a given increased end temperatures are described by two exponential decays curves. The first one is associated to the decay of the traps responsible for the main TL peak. The second exponential is related with the phototransfer from the deep to the main traps. A simple model of the OSL process, based on simultaneous refilling of shallow traps and their reverse filling due to phototransfer from deep traps, under illumination with light is proposed. The model describes well the obtained experimental data. (C) 2004 Elsevier Ltd. All rights reserved.