A new approach for the investigation of ancient silver coins: depth profile analysis by laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS)
Guillaume Sarah|Bernard Gratuze|Marc Bompaire|Jean-Noël Barrandon
Laser Ablation Inductively Coupled Plasma Mass Spectrometry (LA-ICP-MS) is a powerful analytical technique that successfully used in many fields for the analysis of solid samples. The number elements can be determined and swiftness are main advantages this technique. It also allows permits collection concentration profiles as penetration laser sample progressive. specificity has been specially exploited study to apply LA-ICP-MS ancient silver coins. These coins often covered by surface enrichment layer discarded. profile perfect tool achieve this: visualization variation penetrates sample, so it possible determine composition alloy not disturbed phenomena. major (Ag Cu) five minor (Zn, Sn, Au, Pb, Bi) analyzed way, whereas trace an average on entire ablation. most suitable parameters have defined. reliability protocol developed verified comparison with Fast Neutron Activation Analysis, proving relevance Carolingian study. This coinage was relevant development better understanding early medieval economy. Some preliminary results topic presented here.
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