| Affiliation: | (1) School of Electronic Information, Wuhan University, 430072 Wuhan, Hubei, China;(2) College of Chemistry and Molecular Sciences, Wuhan University, 430072 Wuhan, Hubei, China |
| Abstract: | Twenty Yongzheng copper coins were fast dating by X-ray energy dispersive spectrometer with scanning electron microscope (SEM-EDS) according to official ingredient. The 20 coins were classified in two groups according to the results. Group 1 represents the coins minted before AD 1 728 and group 2 represents the coins minted after AD 1 728. At concentration range (0.00%–5.13%), the distribution of lead is not homogeneous in the coins, and the largest diameter of lead inclusion is less than 15 μm. The official fineness degrade is supported. Foundation item: Supported by the Project of Instrument Upgraded of Ministry of Science and Technology of China Biography: Lei Jun-feng (1975-), male, Ph. D, research direction: numismatic archaeology and instrument analysis. |
