Abstract
In the present work, electron paramagnetic resonance (EPR) spectra and thermoluminescence (TL) emission of colourless natural topaz from Santo Antônio do Jacinto, Brazil, was studied as a function of thermal treatment and gamma irradiation dose, focussing on the use of this material as a radiation dosimeter. EPR measurements on “as-received” samples at room temperature provided signals in the region of about 500 at 5000 G. The signal located around g ≅ 2 , frequently attributed to (AlO 4) 0, increased with additional gamma dose and disappeared after thermal treatment at 500 °C for 1 h. Irradiation after thermal treatment recovered this signal. The decay promoted by isochronal thermal treatment showed the (AlO 4) 0 defects to be directly related to the TL glows peaks. The variation of EPR spectrum with annealing temperature prior to irradiation showed that the variation of TL sensitivity is a consequence of the variation of the (AlO 4) 0 population.
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