Estimation of the Trapping Parameters of Li2B4O7:Ag, Gd Phosphor using FGC, ID and CGCD Methods

Abstract

Lithium tetraborate (Li2B4O7) phosphor is a well-known candidate for thermoluminescence dosimetry (TLD), mostly because of its near tissue equivalence. In this study, Li2B4O7:Ag,Gd phosphor was synthesized using Solution Combustion Synthesis (SCS) method; its kinetic parameters such as trap depth (Ea), frequency factor (s) and order of kinetics (b) were evaluated. The TL glow curve of the phosphor consists of three glow peaks at ~80, 160 and 260 ˚C with a heating rate of 1 ˚C/s after 10 Gy beta dose exposure. The activation energies for 160oC TL peak obtained using Fractional Glow Curve (FGC), Isothermal Decay (ID) and Computerized Glow Curve Deconvolution (CGCD) methods were calculated to be 0.86, 0.85 and 0.94 eV, respectively. The frequency factor for the same TL peak was determined as 3.20 x 1014 s-1 and 3.62x109 s-1 using FGC and CGCD methods, respectively. It can be concluded that the activation energies obtained by differentmethods are in agreements with each other.