Historical mortars dating from OSL signals of fine grain fraction enriched in quartz |
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Authors: | Giuseppe Stella Dorotea Fontana Anna Maria Gueli Sebastiano Olindo Troja |
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Affiliation: | 1. PH3DRA Laboratories (Physics for Dating Diagnostic Dosimetry Research and Applications), Dipartimento di Fisica e Astronomia, Università di Catania & INFN Sezione di Catania, Via Santa Sofia 64, 95123, Catania, Italy 2. Earth Sciences Dep., Faculty of Science and Technology, University of Coimbra, IMAR-CMA, Rua Sílvio Lima, 3030-790, Coimbra, Portugal 3. Laboratorio di Fisica e Tecnologie relative — UniNetLab, Dipartimento di Fisica e Chimica, Università degli Studi di Palermo, Viale delle Scienze, Edificio 18, 90128, Palermo, Italy
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Abstract: | In the last years the mortar dating through Optically Stimulated Luminescence (OSL) techniques has become a viable support for chronological estimations (date of construction or restoration episodes) of historical buildings. However, the dating of mortar has still open issues mainly regarding the assessment of the bleaching degree of quartz, the analysis of the OSL processes for this type of samples and the need to do appropriate tests for the most correct evaluation of the equivalent dose. This paper discusses the results obtained by OSL dating (blue diode stimulation) on the polymineral fine grain phase, enriched in quartz, extracted from lime mortar samples collected from different sites. Thermal transfer effects, through the behaviour of Equivalent Dose (ED) and recovery tests, degree and time of bleaching were studied. For each mortar sample the adjacent brick was collected; in some cases, sampling of the bricks bracketing a mortar layer was a possibility, thus obtaining a direct comparison with the standard thermoluminescence (TL) dating on the bricks. The results obtained show, for this set of samples, the possibility of dating the mortars through the use of the fine grain fraction provided of a suitable chemical-physical preparation procedure and the verification of the bleaching conditions. |
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