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The use of ED-XRF technology to measure gold assay after the introduction of ISO 23345

Valerio Doppio

ED-XRF analysis techniques are becoming increasingly popular in the jewelry industry. The possibility of measuring a finished object of even complex shape, without destroying or ruining it, very quickly, is a unique attraction compared to other conventional techniques (e.g., ICP or fire assay). Despite their relative popularity, however, X-ray fluorescence-based techniques were generally relegated to a marginal role, limited to checking the rough composition, due to the perception that this type of measurement is inaccurate. Calibrating the analyzer with good references, choosing specific measurement parameters, and understanding the structure of the analyzed jewelry are fundamental in allowing much more precise and accurate measurements. In our tests, we work with and on the new ISO 23345:2021, which defines calibration, measurement, and interpretation of data for fineness analysis by ED-XRF.


Valerio Doppio

Valerio Doppio is a R&D manager in Progold S.p.A. in Trissino, Italy. He has a Master degree in Materials Science from the University of Padua and a postgraduate degree in Journalism and Science Communication from the University of Ferrara. He has been working at Progold since 2013, dealing mainly with Research and Development, but also assisting in the activities of the Technical Assistance and Quality Control departments.