A fast?integrated x?ray emission spectrometer dedicated to the investigation of Pt presence in gold Celtic coins (3rd–1st century <scp>BCE</scp>)

With this study, we present the development of a transportable x-ray emission spectrometer (XES) that was realized in net time 20 h, order to verify presence Platinum (Pt) gold Celtic coins belonging 3rd–1st century BCE. Prior XES measurements using Scanning Electron Microscopy coupled with Energy Dispersive Spectroscopy (SEM-EDS) revealed were made highly concentrated (Au) alloy trace amounts bismuth (Bi) and, one case, osmium (Os) and iridium (Ir). Os Ir together Pt other components belong Group Elements (PGE). They form inclusions ancient alloys their is significant provenance studies since they indicate use alluvial gold. Detection platinum elements golden matrix not possible energy dispersive techniques (SEM-EDS, ED-XRF, or PIXE) because limited resolution Si detectors. A way overcome problem by high-resolution wavelength technique. For purpose, built crystal Von-Hamos geometry. In framework study three samples/coins have been measured, verified them. The limitations our are critically evaluated ways optimize performance discussed.