Using Negative Muons as a Probe for Depth Profiling Silver Roman Coinage
AbstractDebasement of silver Roman coins is a well-known phenomenon and understanding the quality of ancient silver coinages can provide an idea about the underlying fiscal condition of the issuing states. These coins are made from a silver-copper alloy, the surfaces of which were deliberately enhanced at the mints by a process of surface-enrichment to give them the appearance of being made of pure silver. Therefore, any surface analysis would provide a composition of the silver-copper alloy that would not be representative of the original alloy from which the coin blank was made; the result would be too high in silver. However, the bulk of the sample, the interior, should provide a composition that is true to the original alloy. Elemental analysis using negative muons has been used to provide a depth dependent compositional, completely non-destructive analysis of a silver-copper alloy denarius of the empress Julia Domna datable to 211–217 CE. The composition of the coin, beyond the surface enrichment layer, is 51 ± 1.8 % copper and 49 ± 1.9% silver, taken at a muon depth of 402 ± 61 µm. The surface enrichment layer is approximately 190 µm thick. View Full-Text
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Hampshire, B.V.; Butcher, K.; Ishida, K.; Green, G.; Paul, D.M.; Hillier, A.D. Using Negative Muons as a Probe for Depth Profiling Silver Roman Coinage. Heritage 2019, 2, 400-407.
Hampshire BV, Butcher K, Ishida K, Green G, Paul DM, Hillier AD. Using Negative Muons as a Probe for Depth Profiling Silver Roman Coinage. Heritage. 2019; 2(1):400-407.Chicago/Turabian Style
Hampshire, Bethany V.; Butcher, Kevin; Ishida, Katsu; Green, George; Paul, Don M.; Hillier, Adrian D. 2019. "Using Negative Muons as a Probe for Depth Profiling Silver Roman Coinage." Heritage 2, no. 1: 400-407.