Table 2 Lead isotopic composition of the ingot from Wrocław and lead/zinc ore from the mine in Trzebinia and the lead ingot with the stamp of the Olkusz mine analysed by MC-ICP-MS and TIMS. For MC-ICP-MS errors are 2 SD (standard deviation) propagated for standard reproducibility and refer to the last significant digits. TIMS data were published previously [50] and have the analytical errors better than ± 0.1% for each independent ratio

From: Analytical studies on medieval lead ingots from Wrocław and Kraków (Poland): a step towards understanding bulk trade of lead from Kraków and Silesia Upland Pb–Zn deposits