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A Roman bronze statuette with gilded silver mask from Sardinia: an EDXRF study |
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| Authors: | Roberto Cesareo Antonio Brunetti Rubens D’Oriano Alba Canu Gonaria Mattia Demontis Angela Celauro |
| Institution: | 1. Istituto per lo Studio dei Materiali Nanostrutturati, CNR-Montelibretti, via Salaria km. 29.5, Monterotondo, 00015, Rome, Italy 2. Dipartimento di Scienze Politiche, Scienza della Comunicazione e Ingegneria dell’ Informazione, Universitá di Sassari, Sassari, Italy 3. Soprintendenza per i Beni Archeologici, Sassari, Cagliari, Italy 4. Centro di Restauro della Soprintendenza per i Beni Archeologici, Sassari, Cagliari, Italy 5. Dipartimento di Scienze della Terra, Università di Roma ‘La Sapienza’, Rome, Italy |
| Abstract: | A Roman bronze statuette from the 2nd Century BC was recovered from a nuragic sanctuary close to Florinas, in the north of Sardinia. The facial portion of the statuette is covered by a silver mask, partially gilded and attached to the bronze by tin-lead welding. The silver mask was carefully analyzed by portable energy-dispersive X-ray fluorescence (EDXRF), a non-destructive and non-invasive method. The aim of the analysis was to reconstruct the layered structure of the silver gilt mask, and to determine homogeneity and thickness of the gold, silver and lead–tin sheets. This is possible by using the internal ratio of the X-ray lines, i.e. starting from the surface, Au (Lα/Lβ), Ag (Kα/Kβ), Au-Lα/Ag-Kα and Pb (Lα/Lβ).The results were compared with those obtained with simulated X-ray spectra, obtained both experimentally and by using the Monte Carlo simulation technique. |
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