Characterization of thermoluminescence kinetic parameters of beta irradiated B doped Ca-5(PO4)(3)OH powder obtained from eggshell

Abstract

In this study, we have synthesized B doped Ca5(PO4)3OH (HAP) by a sonication chemical method. The thermoluminescence (TL) properties of the family of synthesized samples (B doped Ca5(PO4)3OH (HAP) were investigated using an IRSL-TL 565 nm filter. This gave the highest TL intensity of each phosphor after 2 Gy beta-irradiation. Three TL glow peaks of B doped Ca5(PO4)3OH (HAP) are centered at around 84, 208 and 324 degrees C (with a heating rate of 2 degrees Cs-1). The trapping parameters such as activation energy (E), order of kinetics (b), frequency factor (s) were calculated by using initial rise (IR), various heating rates (VHR) and computerized glow curve deconvolution (CGCD) method. The response of TL glow curves remained constant within +/- 5% deviation from the initial value after 9 cycles of reuse; but only at tenth cycle the deviation goes up to 6%.