Abstract
A decoration figure of a ritual bronze vase from Canas de Senhorim (Portugal) was analysed by Energy Dispersive X-Ray Fluorescence (EDXRF) spectromttly and Synchrotron Inducted X-Ray Fluorescence (SXRF) microprobe spectrometry. This artefact, a CenSuas constitutesthe first evidencefor a possible Roman occupation of this region of central Portugal and it is also one of the very few artefacts of this type ever found. The determination of the Centaurus alloy composition will be important in the flurthercomprehension of the metallurgical technologies used by the Romans in this region. EDXRF analysis of the corroded surface were made using the monochromatic radiation emitted by Ag and Gd secondary targets excited by a Rh X-ray tube at 35kV and 57 kV, respectively. SXRF experiments were carried out both on the corroded surface and on a small clean area of the artefact, using both monochromatic and polychromaticexcitations with 32 key and 12 keV radiations. EDXRF results allowed the determination of the alloy bulk composition. The SXRF comparative analysis between the clean and corroded are evidences the surface enrichment in Sn and establishes the composition of the original alloy. The Cenlaurus alloy is a bronze with rather high Pb content, which is characteristic of the Roman decorative artefacts.
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