Thermoluminescence kinetics analysis of α-Al2O3:C at different dose levels and populations of trapping states and a model for its dose response

Kinetic analysis of a α-Al2O3 (TLD-500) thermoluminescent (TL) dosimeter was performed following irradiating the samples with 60Co gamma rays. The number of glow peaks contained in the complex glow curve of this phosphor was identified using the Tm − Tstop method, which demonstrates three component glow peaks. A computerized glow curve deconvolution (CGCD) program was used to determine the trapping parameters of the three constituent glow peaks obtained at different dose levels and different populations of trapping states. To analyze the number of constituent glow peaks, we used a kinetic model to describe both the irradiation and heating stages. The predictions of the model for the TL response agreed well with the experimental data when three dosimetry traps were incorporated.

► We found three component glow peaks for α-Al2O3 (TLD-500) using Tm − Tstop method. ► A kinetic model was presented based on three component glow peaks. ► The presented model with 3 glow peaks gives the TL response in good agreement with the experiment. ► Kinetic parameters were evaluated in different doses and populations of states.