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1 2008

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Milling-induced reset of thermoluminescence and deformation of hydroxyl species in the near-surface layers of quartz grains

Takeuchi A., Hashimoto T.

Geochronometria

2008

Vol. 32

61-68

Reset mechanisms of thermoluminescence (TL) signals in the near-surface layers (∼500 nm thick) of quartz grains during milling are discussed on the basis of the dependence of TL glow-curves and infrared absorption spectra on grain diameter. TL measurements (heating to 370 °C at 1 °C/s) indicate that the near-surface layer does not seem to emit TL at ∼250-400 °C, especially in the blue range, even in TL measurements after re-irradiation. In contrast, the layer seems to emit more TL at ∼130 °C than the inner original quartz. On the other hand, diffused reflection infrared Fourier transform spectrometry indicates that hydroxyl species (e.g. Al-OH, Li-dependent OH and molecular H2O species) are deformed in the near-surface layer. These two series of data suggest that TL recombination sites in the near-surface layer are deformed or broken during milling and contribute to TL emission unusually strongly.