Properties of TR-OSL signals in heated zircon

초록

In this paper, Time Resolved-OSL (TR-OSL) spectra of heated zircon were physically investigated under various experimental pulse conditions and the results were discussed in comparison with those reported in previous literatures. Analyses of the TR-OSL signals have shown that the decay consists of two components with lifetimes of 10.2 +/- 0.7 mu s for fast component and 99.6 +/- 4.3 mu s for slow component on the conditions of pulse width of 100 mu s, dynamic range (pulse duration) of 250 mu s and sweep number of 105. Considering the relationship between the lifetime and the dynamic range, the preheating temperature and duration, and the magnitude of radiation dose, the fast component showed independent results while the slow component was found to be dependent on the dynamic range and the magnitude of radiation dose. Based on the variations in TR-OSL intensities depending on measurement temperatures, the thermal assistance activation energies of 0.05 +/- 0.01 eV for fast component and 0.07 +/- 0.01 eV for slow component, and the thermal quenching activation energies of 0.76 +/- 0.05 eV for fast component and 0.82 +/- 0.03 eV for slow component, which were found to be very close to each other, were evaluated.

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