Summary. - We present here the first results of a work following an interdisciplinary study of the gold issues from Gaul's Atlantic front. Using neutron activation analysis we determined the composition of more than one hundred of Gallic west-center silver coins. It allows us to begin to precise their structure and relative chronology as well as to study the relation between gold and silver and the alteration techniques used by the manufactors of the silver coins.
Trente-trois pièces du dépôt celtique de Tayac (Gironde) ont été analysées par activation protomique. Les monnaies de ce trésor se répartissent en deux groupes, le second résultant de la refonte des monnaies du premier groupe avec des monnaies d'argent. Ces résultats vont dans le sens d'une datation du trésor dans la première moitié du 1er siècle av. J.-C.
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