OSL from BEO ceramics: New observations from an old material

摘要

In BeO ceramics, exposed to ionizing radiation, an intense OSL signal was observed. The properties of the signal and its behavior under various experimental conditions were investigated. It was found that the OSL signal is a composite signal and exhibits strong thermal quenching. The quenching energy was estimated as similar to 0.5 eV. The excitation spectrum of the OSL signal was obtained as a broad peak in the region 420-550 nm with maximum around 435 nm. The possible correlation between the OSL signal and the peaks in the TL glow curve was also examined. It was interesting to observe that the highly light sensitive TL peak near 220 degrees C does not contribute to the OSL signal. The OSL signal was found to originate from a trap near 340 degrees C. To check the possibility of using the material for radiation dosimetry the dose response and thermal stability of the OSL signal were also investigated. The dose response was found to be guile linear up to similar to 10 Gy. The thermal activation energy of the OSL trap was determined as similar to 1.7 eV using isothermal annealing and heating rate methods thus proving the suitability for dosimetry. (C) 1998 Elsevier Science Ltd. Ail rights reserved. [References: 34]