Thermoluminescence features of alumina-mixed borophosphate glasses with Tb3+ ions for dosimetric applications

摘要

Amorphous barium borophosphate materials doped with small quantity of terbium ions and with the addition of some amounts of alumina were prepared. Thermoluminescence (TL) characteristics of these glasses were investigated after irradiating them with different doses of -rays (in the range 0.5-8.0kGy). The TL emission exhibited a dosimetric peak at about 210 degrees C. The TL output under this glow peak is observed to increase with the -ray dose. For any fixed -ray dose, the TL output is increased with increase in Al2O3 content up to 3.0mol%, and beyond this concentration, quenching of TL is visualized. The dose response of TL output of these glasses exhibited linear behavior in the dose range 0.5-4.0kGy. The mechanisms responsible for TL emission and the variation of TL output with the concentration of Al2O3 are quantitatively discussed in terms of structural defects induced during -ray irradiation. Finally, it is concluded that these glasses are potential materials for dosimetry applications in the dose range 0.5-4.0kGy.