Non-destructive examination of roman silver coins by neutron activation analysis |
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Authors: | A. van Dalen H. A. Das J. Zonderhuis |
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Affiliation: | (1) Reactor Centrum Nederland, Petten, (The Netherlands) |
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Abstract: | The detection of “plated” specimens (ancient falsifications consisting of a copper core with a silver outer layer) amidst a great collection of silver coins was performed by non-destructive neutron analysis. The “plating” can be detected by measuring the Ag/Cu ratio. In practice it is more convenient to determine the Au/Cu ratio which is proportional to it, A short activation in a low thermal neutron flux is sufficient for this purpose. Consequently the induced activity of the long-lived110mAg is small. The necessary correction for self-absorption on the measured ratio is small. A series of 2000 coins was analysed in this way. |
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