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Time-resolved OSL of natural zircon: A preliminary study

Bulur, Enver
Sarac, B. E.
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 temperatures similar to 250 degrees C then becomes unstable. The dose response of the TR-OSL signal from zircon was determined in the range from 1 Gy to 1 kGy and observed to be increasing linearly. Practically, no effect of radiation dose on the lifetimes of signal components was observed. In addition, the effect of measurement temperature on the TR-OSL decay lifetimes was also investigated. Thermal quenching energies of the "fast" and the "slow" components were found to be very close to each other i.e. 0.18 and 0.24 eV respectively.