Terbiyum katkılı Mg2SiO4 fosforunun termolüminesans kinetik parametrelerinin ışıma eğrisi ayrıştırma yöntemi ile incelenmesi

The aim of this study is to determine the kinetic parameters of glow curve of Mg2SiO4:Tb dosimeter. The kinetic parameters of terbium doped Mg2SiO4 dosimeter such as activation energy (E), frequency factor (s) and kinetic order (b) are obtained by peak shape, isothermal decay and glow curve deconvolution methods. Glow curve deconvolution analyses are carried out by using Mathematica and PeakFit softwares. It is observed that Mg2SiO4:Tb dosimeter consists of combination of 3 individual glow curves for the given temperature range. Activation energy and frequency factor values are determined by experimentally and by glow curve deconvulation method. The activation energy values obtained by Mathematica and PeakFit are 1.05 ve 1.1 eV range, respectively while frequency factor is 2.2x1010 s-1 range. Finally, the figure of merit (FOM) and r2 values, that shows the accuracy of the fit, are calculated. The FOM value calculated by using Mathematica and the r2 value calculated by using PeakFit are % 3.4 and 0.9988, respectively for fit with 3 peaks. The FOM and r2 values indicate that the experimental data and the theoretically fit are in good agreement. According to these results, it can be stated that the glow curve of Mg2SiO4:Tb dosimeter consists of three individual peaks as being one main dosimetric peak at about two high temperature peaks at 1950C, and 2750C, and 3500C. All these three peaks obeys second order kinetics.