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Optically stimulated luminescence of amorphous/microcrystalline SiO₂ (silex): Basic investigations and potential in archeological dosimetry

Title data

Schmidt, Christoph ; Kreutzer, Sebastian:
Optically stimulated luminescence of amorphous/microcrystalline SiO₂ (silex): Basic investigations and potential in archeological dosimetry.
In: Quaternary Geochronology. Vol. 15 (February 2013) . - pp. 1-10.
ISSN 1871-1014
DOI: https://doi.org/10.1016/j.quageo.2013.01.005

Official URL: Volltext

Project information

Project title:
Project's official titleProject's id
SFB 806 'Our Way To Europe'SFB806

Project financing: Deutsche Forschungsgemeinschaft

Abstract in another language

Unlike the well-studied optically stimulated luminescence (OSL) signal of (macrocrystalline) quartz, not much is known about OSL from natural amorphous and microcrystalline silicon dioxide. These materials - generally termed “silex” - were widely used for prehistoric tool production, and thermoluminescence (TL) is routinely applied do date the firing event of heated specimens. This study presents data on basic OSL characteristics of silex such as signal composition and component-resolved thermal stability as well as the applicability of OSL for dating of burnt lithic tools. Fitting of LM-OSL curves yielded similar components (mostly five) as observed for quartz, with the photoionization cross-sections being in the same order of magnitude for both materials. Three different methods (LM-OSL pulse annealing, short-shine pulse annealing as well as the varying heating rate method) were applied to study the thermal stability of components and allowed calculating trap parameters E and s, and hence the electron retention lifetime. Only the most light-sensitive ("fast- like") component proved to be of sufficient thermal stability for dating applications, as evidenced from coherent experimental results. All other components already diminished at preheating temperatures > 200 °C. Pulse annealing measurements further indicate that electron populations sampled by OSL and those responsible for the ca. 380 °C TL-"dating peak" are not identical. Dose recovery tests applying an OSL-SAR protocol with "hot bleach" in between the regeneration cycles showed good reproducibility of a known dose if only the initial OSL signal (ca. 0-0.5 s at 90% LED power) is used. Finally, obtained OSL-SAR and TL ages based on the blue TL emission are in agreement within errors for two Middle Paleolithic archeological samples showing a “fast-like” component. These results verify the experimental findings of sufficient long-term stability of the initial OSL signal. Since not all silex specimens deliver a bright and stable OSL signal, optical ages of suitable samples may serve as an additional internal check for the paleodose estimate rather than substituting TL as a standard technique for dating of heated silex.

Further data

Item Type: Article in a journal
Refereed: Yes
Keywords: Flint; OSL; LM-OSL; Dating; Component; Lifetime
Institutions of the University: Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Earth Sciences > Former Professors > Chair Geomorphology - Univ.-Prof. Dr. Ludwig Zöller
Profile Fields > Advanced Fields > Ecology and the Environmental Sciences
Profile Fields > Advanced Fields > Nonlinear Dynamics
Research Institutions > Research Centres > Bayreuth Center of Ecology and Environmental Research- BayCEER
Faculties
Faculties > Faculty of Biology, Chemistry and Earth Sciences
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Earth Sciences
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Earth Sciences > Chair Geomorphology
Profile Fields
Profile Fields > Advanced Fields
Research Institutions
Research Institutions > Research Centres
Result of work at the UBT: No
DDC Subjects: 500 Science > 550 Earth sciences, geology
Date Deposited: 11 Jan 2016 10:37
Last Modified: 11 Jan 2016 10:37
URI: https://eref.uni-bayreuth.de/id/eprint/29567