Thermo luminescence and optically stimulated luminescence characteristics of Al2O3 doped with Tb
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2014-12-01
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Soares, J. V.
Gugliotti, C. F.
Kawashima, Y. S.
Tatumi, Sonia Hatsue [UNIFESP]
Mittani, Juan Carlos Ramirez [UNIFESP]
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In the present work policrystals of alpha - Al2O3 doped with terbium were synthesized using the solvent evaporation method. the samples were prepared using Al(NO3)(3)center dot 9H(2)O and Tb(NO3)(3).5H(2)O reagents, with Tb concentrations between 1 and 5 mol% and thermally treated at high temperature above similar to 1400 degrees C. X-ray diffraction measurements showed the a-phase formation of samples. TL glow curve presented an intense peak at similar to 190 degrees C and two other with low intensity at 290 and 350 degrees C after gamma irradiation. the best doping concentration which presented high luminescence was the sample doped with 3 mol% of Tb. U spectra and fluorescence measurements showed similar luminescence spectra with lines attribute to Tb3+ ions. A linear behavior to gamma dose between 1 and 20 Gy was observed in TL, using 190 degrees C peak as well as in OSL signal, this last carried out using 532 nm wavelength stimulation. (C) 2014 Elsevier B.V. All rights reserved.
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Radiation Measurements. Oxford: Pergamon-Elsevier B.V., v. 71, p. 78-80, 2014.