Fig. 9
From: Sample size and the limits to precision in Pb-isotopic dating by ID-TIMS
Changes in the 207Pb*/206Pb* model dates for the reference material EarlyTime 1× (the same analysis as shown in Figs. 7 and 8) as a function sample/spike ratio, expressed as fractionation-corrected 206Pb/205Pb ratio. Green, blue and red lines represent 10, 20 and 30% changes, respectively, in the abundances of minor isotopes in the 202Pb-205Pb spike, expressed as the ratios of 204Pb, 206Pb, 207Pb and 208Pb to the major isotope 205Pb, assumed in the data reduction. The horizontal orange line shows the significance threshold adopted in this study