Examinando por Autor "Lycke, Sylvia"
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Ítem A comparative mobile Raman study for the on field analysis of the Mosaico de los Amores of the Cástulo Archaeological Site (Linares, Spain)(John Wiley & Sons, Ltd, 2020-04) Rousaki, Anastasia; Costa, Mafalda; Saelens, Delphine; Lycke, Sylvia; Sánchez-Vizcaino, Alberto; Tuñón, José; Ceprián, Bautista; Amate, Pilar; Montejo, Manuel; Mirão, José ; Vandenabeele, PeterAn in situ archaeometrical campaign was organized in 2018 for the physicochemical analysis of the exceptional Mosaico de los Amores of the Cástulo archaeological site (Linares, Spain). Several mobile instruments were brought on the field to investigate the colourful tesserae of the mosaic. The main aim of the current research paper is the comparison of different mobile instruments and their applicability on measuring in open air environments. In this study, the comparison of four mobile Raman instruments, using different excitation lasers and technologies, is discussed. Three portable, the EZRaman‐I dual Raman analyser from TSI Inc. (USA), the i‐Raman® EX from BWTEK (USA), and the BWS445‐785S InnoRam™ Raman spectrometer from BWTEK (USA), and one handheld system, the Bravo Raman spectrometer from Bruker (Europe), are compared in terms of their characteristics, applicability, and performance when conducting non‐invasive and non‐destructive analysis.Ítem Comparison of the performance of two handheld XRF instruments in the study of Roman tesserae from Cástulo (Linares, Spain)(Springer Nature, 2020-08-11) Costa, Mafalda; Rousaki, Anastasia; Lycke, Sylvia; Saelens, Delphine; Tack, Pieter; Sánchez-Vizcaino, Alberto; Tuñón, José; Ceprián, Bautista; Amate, Pilar; Montejo, Manuel; Mirão, José; Vandenabeele, PeterCultural Heritage objects are frequently unavailable for transportation to laboratory facilities due to their size, location or local Cultural Heritage preservation regulations. The development of handheld XRF (hXRF) systems has, therefore, proven to be essential in the study of unmovable objects. In this study, two handheld XRF instruments—Bruker™ Tracer III SD® and Olympus™ Innov-X Delta Premium—were compared and evaluated using tesserae from the Mosaico de los Amores (Linares, Spain). Given their portability, the user-friendly nature of their operating systems and their overall performance, both hXRF instruments are highly recommended for in situ campaigns in Cultural Heritage studies. However, the detection limits calculated for each element point towards a better detection of low-Z elements when using the two-beam mode of the Olympus™ Innov-X Delta Premium hXRF. This study underlines the importance of systems that allow the analysis of the same point with analytical conditions optimized for different chemical elements.Ítem First insights into the archaeometric analysis of the Los Amores Mosaic in Cástulo (Linares, Spain): the Judgement of Paris.(Springer, 2021-02-09) Sánchez-Vizcaino, Alberto; Tuñón, José; Montejo, Manuel; Amate, Pilar; Ceprián, Bautista; Rousaki, Anastasia; Costa, Mafalda; Saelens, Delphine; Lycke, Sylvia; Vandenabeele, PeterThis paper discusses results obtained from in situ analysis of the tesserae of the Roman mosaic of Los Amores (Cástulo site, Linares, Spain) dating back to the turn of the 1st to the 2nd century AD. Specifically, it focuses on the scene The Judgment of Paris. In view of the exceptional state of preservation of the mosaic, from which very few tesserae had fallen off, non-invasive methods with portable Micro Raman Spectroscopy (MRS) and hand-held X-ray fluorescence (hXRF) and data assessment by use of principal component analysis and binary representations were selected. The results obtained allow to evaluate both the analytical method and the portable equipment used, as well as to classify the raw materials, the colouring agents and the opacifiers used. MRS analysis proved crucial for the identification of stone tesserae (ironstones, carbonate and siliciclastic rocks) and for the identification of the type of glasses used (soda-lime-silicate and lead type glasses) based on the analysis of two detached tesserae. hXRF analysis of the glass tesserae identified both colouring agents (Co, Cu, Pb, Zn) and opacifiers (calcium antimonate). The data obtained lend themselves to an assessment of the degradation process that threaten the integrity of the mosaic. The identification of tessera made of specific stone materials (especially ironstone) and of lead glass tesserae suggest the existence of a mosaic workshop in the Upper Guadalquivir (Eastern Andalusia, Spain).