Determination of kinetic parameters of lanthanum doped zinc borates

Thermoluminescence (TL) glow curves of 1% , 2% , 3% and 4% lanthanum doped zinc borate (ZnB2O4:La) phosphors synthesized by nitric acid method were obtained by irradiation at the dose range of 143 mGy - 60 Gy with 90Sr/90Y beta source, which has 40 mCi activity, included in the Risø TL/OSL DA-20 reader system. TL glow curves were recorded after pre-heating process at 140 °C and then heating up to 450 °C in nitrogen atmosphere at a constant heating rate of 5 °C/s. In this study, with the help of glow curve readings, kinetic parameters of the main TL glow peaks of La doped ZnB2O4 phosphors (i.e. activation energies and frequency factors) were determined and evaluated by the method of computerized glow curve deconvolution (CGCD), peak shape method (PS) and initial rise method (IR). In conclusion, kinetic parameters found in this study by the methods applied to La doped ZnB2O4 phosphorus were consistent with each other.