Annealing experiments on thermoluminescence of quartz phenocrysts and its application to TL dating

概要

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Laboratory annealing experiments were performed to examine the effect of heating on the thermoluminescence (TL) of quartz phenocrysts from dacite. The total number of photons emitted in the temperature range 100-450℃ was counted using a highly-sensitive TL system in order to characterize the decay of TL normalized to natural quartz. Fitting the results at each heating temperature gave a power function that can be used to calculate the TL reduction ratio for arbitrary annealing temperatures and times. The TL reduction lines are curved in an Arrhenius plot, indicating that the activation energy varies even within the experimental temperature range. The plot shows that TL emission decays by up to 50% when heated at 50℃ for less than tens years without the generation of luminescence traps. In addition, during the process of annealing, the peak position in the glow curves shifts linearly to higher temperatures with decreasing TL intensity, implying that it is possible to estimate the initial intensity and that such samples are datable by conventional TL methods.
九州大学の論文