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Milling-Induced Reset of Thermoluminescence and Deformation of Hydroxyl Species in the Near-Surface Layers of Quartz Grains

Milling-Induced Reset of Thermoluminescence and Deformation of Hydroxyl Species in the... Milling-Induced Reset of Thermoluminescence and Deformation of Hydroxyl Species in the Near-Surface Layers of Quartz Grains 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 H 2 O 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. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Geochronometria de Gruyter

Milling-Induced Reset of Thermoluminescence and Deformation of Hydroxyl Species in the Near-Surface Layers of Quartz Grains

Geochronometria , Volume 32 – Jan 1, 2008

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Publisher
de Gruyter
Copyright
Copyright © 2008 by the
ISSN
1733-8387
eISSN
1897-1695
DOI
10.2478/v10003-008-0021-x
Publisher site
See Article on Publisher Site

Abstract

Milling-Induced Reset of Thermoluminescence and Deformation of Hydroxyl Species in the Near-Surface Layers of Quartz Grains 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 H 2 O 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.

Journal

Geochronometriade Gruyter

Published: Jan 1, 2008

References