Time-resolved OSL studies on BeO ceramics

Time-Resolved Optically Stimulated Luminescence (TR-OSL) from BeO ceramics was investigated using a blue laser (445 nm) as stimulation light source. It was observed that, at relatively low dose levels (up to similar to 25 Gy) the TR-OSL decay curve can be approximated with a single exponential decay function with a lifetime of similar to 26 gs at room temperature. Beyond 25 Gy a new decay component with a lifetime of a similar to 2 ts was observed in addition to the similar to 26 mu s component. Thermal stability, radiation dose response, optical bleaching, measurement temperature dependence of the components of the TR-OSL signal were investigated in detail. As result of these studies, a new OSL component which becomes unstable after 150 degrees C was observed. OSL decay rate of this component was found to be higher than the one which becomes unstable after 300 degrees C. In order to obtain information about the temperature dependence of the luminescence efficiency, luminescence emission lifetime was determined in the temperature range from 30 to 130 degrees C with 10 degrees C steps. Using the temperature dependence of the lifetime, thermal quenching energy was determined to be around 0.56 eV for the 26 mu s component. For the similar to 2 mu s component an enhancement in the component intensity was observed pointing to a thermally assisted process with activation energy of 0.15 eV.
Radiation Measurements


Time-resolved OSL studies of YAlO3:Mn2+ crystals
Time-Resolved Optically Stimulated Luminescence (TR-OSL) from single crystalline YAlO3:Mn2+ samples was investigated using a green light emitting diode (lambda- 525nm) as stimulation light source. The TR-OSL decay curve of the material can be described with a single exponential decay function with a lifetime about 80 ms that does not depend on irradiation dose in the range from 50 mGy to 1 kGy. This OSL decay is superposed on a photoluminescence signal with a much shorter (3.5 ms) decay lifetime. The Mn2+ p...
Time-resolved OSL of natural zircon: A preliminary study
Bulur, Enver; Sarac, B. E. (Elsevier BV, 2014-01-01)
Time-resolved OSL (TR-OSL) from natural zircon (ZrSiO4) minerals was investigated using 445 nm blue laser light for stimulation. Analyses of the TR-OSL spectra have showed that the decay is composed of two exponential components with lifetimes varying around similar to 17 mu s and around similar to 110 mu s respectively. The behaviour of these signal components, was examined under various sample treatments and experimental conditions. Preheating experiments showed that the OSL signal is stable up to tempera...
Optically stimulated luminescence characteristics of BeO nanoparticles synthesized by sol-gel method
ALTUNAL, VOLKAN; YEĞİNGİL, ZEHRA; TÜKEN, TUNÇ; Depci, T.; ÖZDEMİR, ALİ CAN; Guckan, V.; Nur, N.; Kurt, K.; Bulur, Enver (2018-11-01)
Optically Stimulated Luminescence (OSL) properties of the sol-gel synthesized nano-powders of Beryllium Oxide (BeO) were investigated. Luminescence properties of BeO nanoparticles are dependent on the crystal structure, particle size, and morphology and therefore strongly dependent on the way of synthesis, thus the preparation was modified to enhance the OSL signal from the material. Structural, thermal and morphological properties of BeO in nanopowder and pellet forms were studied using X-Ray Diffraction (...
Photo-transferred luminescence from BeO ceramics
Bulur, Enver (2007-03-01)
Temperature and radiation dose dependences of the thermoluminescence, photo-transferred luminescence signals from BeO ceramics were investigated using blue-green stimulation (420-550 nm). Several deep traps that act as sources for the photo-transferred luminescence signals, located in 400-625 degrees C region of the TL glow curve, were distinguished.
Time-resolved microscopy of femtosecond laser filaments in fused quartz
Kadan, Viktor; Blonskyi, Ivan; Pavlov, Ihor (2022-02-01)
Detailed picture of continuous shape evolution of femtosecond laser pulse has been recorded directly in the process of filament formation in fused silica using time-resolved polarization microscopy with similar to 70 fs temporal resolution. The main stages of the pulse transformation (temporal self-compression and splitting, formation of conical wave) have been studied. The maximum temporal compression has been found to be achieved by the leading subpulse after the time splitting event. It was found that th...
Citation Formats
E. Bulur, “Time-resolved OSL studies on BeO ceramics,” Radiation Measurements, pp. 129–138, 2013, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/28386.