Abstract
Detailed Thermoluminescence studies of Bi2O3 doped with Dy3+ synthesized by solution combustion method and irradiated with -rays and β-rays for doses in the range from a few Gy to KGy was done in the current work. Powder X-ray diffraction (PXRD) analysis is used to calculate the average particle size and was determined to be in the range 13-30 nm. Thermoluminescence (TL) characteristics of β-rayed Bi2O3: Dy3+ doped samples for dose of 1 Gy to 20 Gy are studied. In all -irradiated Bi2O3 : Dy3+ doped samples, at ~145 oC (Tg1) and ~155 oC (Tg2) two significant and well resolved TL glow peaks were observed. Also, the TL intensity is found to increase with dopant concentration up to 5 mol % and then decreases due to quenching. The peak position of both the glow peaks (Tg1 and Tg2) is almost stable for the complete dose range. The activation energy and frequency factors are found to be 0.79 eV and 1.75×1015 s-1 respectively. These values are in very good agreement with those values calculated by peak shape methods and are found to be 0.73 eV and 1.70×1015 s-1 respectively.
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