The main purpose of the experiment is to analyze by means of neutron diffraction a selection of about ten celtic coins (III and II century B.C. ) belonging to the Torino Antiquities Museums collection. Because of their preciousness only non-invasive techniques can be used for analysis. Thanks to the high penetration of neutrons, we expect to have compositional data of the coins bulk. Moreover, we expect structural information concerning the different mineralogical phases as well, in order to make hypotheses about the production process in the ancient mints. Compositional results will be compared with those obtained by means of conventional XRF that are probably influenced by the presence of an enriched superficial silver layers.