Calculation of the Half-Life for the TL Signal of BeO Under Gamma and Alfa/Gamma Irradiation

The thermoluminescent (TL) properties of BeO ceramics (Thermalox 995) were investigated under gamma and alpha/gamma irradiation. Glow curves in both cases exhibit three main peaks at 348 ± 1 K, 477 ± 2 K, and 616 ± 1 K. Activation energies for gammainduced peaks are 0.76 ± 0.03 eV, 1.18 ± 0.04 eV, and 1.11 ± 0.02 eV; these increase slightly under alpha/gamma irradiation to 0.81 ± 0.02 eV, 1.22 ± 0.03 eV, and 1.18 ± 0.01 eV. The kinetic orders are close to first order, with slightly higher values observed for the 477 K peak. Based on these parameters, the half-lives of the TL components were calculated. For gamma: 131 s, 1.92 years, and 522 years; and for alpha/gamma: 168 s, 5.07 years, and 2067 years. Fading experiments on five samples showed deviations of less than 10% from theoretical values for the first peak. The half-life also varied with irradiation time: the 477 K peak showed a decreasing trend, while the 616 K peak increased, indicating differences in trap-filling mechanisms. Deconvolution analysis revealed that the second peak (around 477 K) exhibits the most linear dose response under both irradiation types. These results underscore the significance of analyzing half-life behavior to understand the stability and performance of BeO as a dosimetric material under varied irradiation conditions.