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Common Pb isotopes

Lead isotope ratios are measured on single Re filaments with a silica gel – phosphoric acid emitter solution in static mode, maintaining a 3V 208Pb beam for 200 cycles. Over 100 analyses of the NBS-981 Pb standard yield a highly reproducible average fractionation factor of 0.111 ± 0. 013 %/amu for all isotope ratios measured on the Faraday cups. The reproducible fractionation of the 208Pb/204Pb and 208Pb/206Pb ratios are illustrated below; sample loads are carefully matched to the size of standard samples and are run at similar temperatures and filament currents to control fractionation. We are capable of measuring Pb isotopic compositions of a variety of rocks, minerals, and ores, as well as environmental and anthropogenic samples including waters, soils, paints and gasoline.

Isotope diagram starting at 36.6192 measurement

Isotope diagram starting at 2.16429 measurement