Precious metals determination in ancient coins by portable ED-XRF spectroscopy with a 238Pu source Détermination des métaux précieux dans les monnaies anciennes par spectroscopie ED-XRF portable avec une source de 238Pu
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31 décembre 2009
- handle: 10670/1.d8509f
- hal: hal-02426779
- doi: 10.4000/archeosciences.2396
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Paulo S Parreira et al., « Détermination des métaux précieux dans les monnaies anciennes par spectroscopie ED-XRF portable avec une source de 238Pu », HAL-SHS : histoire, ID : 10.4000/archeosciences.2396
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A portable X-ray luorescence system (pXRF) was employed to analyse a set of gold, silver and billon coins from the collection of theMuseu Histórico Nacional do Rio de Janeiro (MHN), struck during the Brasil Colônia period, under the Dutch occupation, and in Portuguesemints under the reigns of Fernando I (1367 to 1383) and his successor João I (1383 to 1433). he experimental setup consisted of a mini Si-PINdetector and a radioactive source of 238Pu for the excitation of the samples. he aim of the study was to test the possibilities and limitations ofthis portable system for the determination of the coins’ base alloys, and to verify whether the results obtained were consistent with historicalfacts. he Brasil Colônia period coins show about 80.5% gold and 96.8% silver. For the Portuguese coins, we could identify a possible monetarydebasement during the reign of João I. No matrix corrections were made for these preliminary results.