Optically stimulated luminescence of amorphous/microcrystalline SiO2 (silex): Basic investigations and potential in archeological dosimetry |
| |
| Institution: | 1. Institute for Geography, University of Cologne, Otto-Fischer-Strasse 4, 50674 Köln, Germany;2. Department of Geography, Justus-Liebig-University Giessen, Senckenbergstrasse 1, 35390 Giessen, Germany;3. Geographical Institute, Geomorphology, University of Bayreuth, 95440 Bayreuth, Germany;1. LSCE/IPSL, CEA-CNRS-UVSQ, Avenue de la Terrasse, 91198 Gif sur Yvette Cedex, France;2. Université Paris-Sud, GEOPS UMR CNRS-UPS, 91405 Orsay Cedex, France;1. Radiation Safety Management Division, Korea Atomic Energy Research Institute, 989-111, Daedeock-daero, Yuseong-gu, Daejeon, 34057, Republic of Korea;2. Department of Nuclear Engineering, Hanyang University, 222, Wangsimni-ro, Seongdong-gu, Seoul, 04763, Republic of Korea;1. McDaniel College, Physics Department, Westminster, MD 21157, USA;2. Center for Nuclear Technologies, Technical University of Denmark, DTU Risø Campus, DK-4000 Roskilde, Denmark;3. Nordic Laboratory for Luminescence Dating, Department of Earth Sciences, Aarhus University, Risø DTU, DK-4000 Roskilde, Denmark;1. Institute of Nuclear Sciences, Ankara University, 06100, Be?evler, Ankara, Turkey;2. Nuclear Physics Laboratory, Aristotle University of Thessaloniki, 54124, Thessaloniki, Greece;1. Laboratory of Radiation Applications and Archaeological Dating, Department of Archaeometry and Physicochemical Measurements, ‘Athena’—Research and Innovation Center in Information, Communication and Knowledge Technologies, Kimmeria University Campus, GR-67100 Xanthi, Greece;2. Solid State Physics Section, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece;3. Nuclear Physics Laboratory, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece;1. Physics Department, Oklahoma State University, 145 Physical Sciences II, Stillwater, OK 74078, USA;2. Landauer, Inc., Stillwater Crystal Growth Division, 723 1/2 Eastgate, Stillwater, OK 74074, USA |
| |
| Abstract: | 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. |
| |
| Keywords: | |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
