<abstract xmlns="http://www.w3.org/1999/xhtml">Optically stimulated luminescence (OSL) is increasingly applied to the dating of rock surfaces. There is at present no practical way of separating pure minerals (quartz and feldspar) from hard rocks for OSL measurement without losing the grain-size dependent dosimetric information and there is little information about the performance of the single-aliquot regeneration-dose (SAR) measurement protocol on the post-infrared infrared stimulated luminescence (pIRIR) signals from rock slices. The latter is investigated here. Our data indicate that there is a systematic increase in dose response curve saturation (or <italic>D</italic>o) with test dose size when the regeneration doses are first given in increasing order, and then decreasing order. This trend disappears if these orders are reversed. The reproducibility of dose response curves is dependent on the size of the test dose (poorer for small test dose). For rock slices given a saturation dose in the laboratory, it is observed that the sensitivity corrected pIRIR290 signal lies close to saturation level of the dose response curve, for first IR stimulation at temperatures between 50 and 250°C. However, the pIRIR290 signal from naturally saturated slices lies close to the laboratory saturation levels only for higher first IR stimulation temperatures e.g. 200°C or 250°C. Our data confirm earlier suggestions based on sand-grain measurements that, for older samples, accurate measurements close to saturation require that a higher first IR temperature is used.</abstract>

Optically stimulated luminescence (OSL) is increasingly applied to the dating of rock surfaces. There is at present no practical way of separating pure minerals (quartz and feldspar) from hard rocks for OSL measurement without losing the grain-size dependent dosimetric information and there is little information about the performance of the single-aliquot regeneration-dose (SAR) measurement protocol on the post-infrared infrared stimulated luminescence (pIRIR) signals from rock slices. The latter is investigated here. Our data indicate that there is a systematic increase in dose response curve saturation (or Do) with test dose size when the regeneration doses are first given in increasing order, and then decreasing order. This trend disappears if these orders are reversed. The reproducibility of dose response curves is dependent on the size of the test dose (poorer for small test dose). For rock slices given a saturation dose in the laboratory, it is observed that the sensitivity corrected pIRIR290 signal lies close to saturation level of the dose response curve, for first IR stimulation at temperatures between 50 and 250°C. However, the pIRIR290 signal from naturally saturated slices lies close to the laboratory saturation levels only for higher first IR stimulation temperatures e.g. 200°C or 250°C. Our data confirm earlier suggestions based on sand-grain measurements that, for older samples, accurate measurements close to saturation require that a higher first IR temperature is used.

The effect of test dose and first IR stimulation temperature on post-IR IRSL measurements of rock slices

State Key Laboratory of Earthquake Dynamics, Institute of Geology, China Earthquake Administration,

Nordic Laboratory for Luminescence Dating, Department of Geoscience, Aarhus University, DTU Risø Campus,

Center for Nuclear Technologies, DTU Nutech, Technical University of Denmark, DTU Risø Campus,

Geochronometria

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Optically stimulated luminescence (OSL) is increasingly applied to the dating of rock surfaces. There is at present no practical way of separating pure...

The effect of test dose and first IR stimulation temperature on post-IR IRSL measurements of rock slices

Publié en ligne: 30 déc. 2016

Pages: 179 - 187

Reçu: 03 févr. 2016

Accepté: 29 nov. 2016

DOI: https://doi.org/10.1515/geochr-2015-0049

Mots clés
luminescence dating, rock surface, post-IR IRSL (pIRIR), SAR protocol, test dose correction, first IR stimulation temperature

© 2016 J. Liu.

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

The effect of test dose and first IR stimulation temperature on post-IR IRSL measurements of rock slices

Publié en ligne: 30 déc. 2016

Pages: 179 - 187

Reçu: 03 févr. 2016

Accepté: 29 nov. 2016

DOI: https://doi.org/10.1515/geochr-2015-0049

Mots clésluminescence dating, rock surface, post-IR IRSL (pIRIR), SAR protocol, test dose correction, first IR stimulation temperature

© 2016 J. Liu.

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Mots clés
luminescence dating, rock surface, post-IR IRSL (pIRIR), SAR protocol, test dose correction, first IR stimulation temperature