OSL from BeO:Al,Ca ceramics synthesized using sol-gel method

2018-09-09
Özdemir, Adnan
Altunal, Volkan
Güçkan, Veysi
Bulur, Enver
Yeğingil, Zehra
Beryllium Oxide (BeO) ceramic has been widely used for numerous applications in different fields of technology such as nuclear and technological research. Special interest in BeO as a material for personal dosimetry is because of its effective atomic number (Zeff =7.13), which is close to biological tissue (Zeff =7.42). In this study, BeO nanophosphors were synthesized for dosimetric purposes, and doped with aluminum and calcium using sol-gel method. BeO:Al,Ca pellets were prepared from pressed and sintered BeO:Al,Ca nanophosphors at 1600 °C. The structural characterization analysis of BeO:Al,Ca pellets were carried out using X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR) and Scanning electron microscope (SEM) methods. The results of these structure analysis showed that BeO:Al,Ca pellets were successfully produced using the sol-gel method. Luminescence properties of the ceramic pellets produced using BeO nanophosphors were investigated by TL and OSL techniques. The bright OSL signal from BeO:Al,Ca was found as a combination of three decay components using general order kinetic fitting. Decay lifetimes of these components were determined as 5.16, 37.02 and 262.84 s, respectively. Additionally, TL glow curve of BeO:Al,Ca showed three peaks approximately located at 200, 350 and 520 °C. Optically active parts of TL glow curve were determined comparing TL glow curves obtained directly and following blue led stimulation. In order to understand mechanism of luminescence, thermal stability experiment was studied, and the source of the OSL signals was found associated with both the 350 and 520 °C TL peaks. OSL signals indicated very good reusability over 10 cycles and the most deviated value from the first readout was ~ 3 %. The beta dose response was found to be nearly linear in the range 0.1-100 Gy. Furthermore, X-ray luminescence, dark fading and minimum detectable dose properties of the OSL signal were investigated. We concluded that BeO:Al,Ca pellets with the bright OSL signals and low fading characteristics are good luminescent dosimetric materials for detection radiation dose between the dose range of 0.1 Gy to 100 Gy.
Citation Formats
A. Özdemir, V. Altunal, V. Güçkan, E. Bulur, and Z. Yeğingil, “OSL from BeO:Al,Ca ceramics synthesized using sol-gel method,” presented at the 11th International Conference on Luminescence and ESR Dosimetry (2018), Gaziantep, Turkey, 2018, Accessed: 00, 2021. [Online]. Available: https://hdl.handle.net/11511/83631.