TL/OSL Properties of Beta Irradiated Al_2O_3Nanophosphor Synthesized by Microwave Combustion Method

摘要

Stable a-phase of Al_2O_3is synthesized by combustion method usingtemperature controlled microwave oven.Crystalline phase is analyzed by X-ray diffraction (XRD)and average crystallite size is found to be 75 nm.Thermoluminescence (TL) glow curve of Al_2O_3 is studied in UV, blue and open (visible) windows after beta irradiation. A prominent TL glow with peak at 472 K along with shoulders at 416 and 513 K are observed in all three windows. These peaks may be ascribed to F, F2 and F~+- centers. Highest TL intensity isobserved inopen window. Optically stimulated luminescence (OSL) studies in UV and blue windows shows highest intensityin UV window. TL/OSL of phosphor shows linearresponse with beta dose upto 6.16 Gy.TL/OSL properties viz fading,repeatabilityand MDDare studied. TL kinetic parameters are estimated by deconvolution with computerized glow curve deconvolution (CGCD) techniques.