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A Pb isotope analytical method using a 207 Pb– 204 Pb double spike (DS) and a double-focusing MC-ICP-MS routinely yields standard and sample data with an external reproducibility <100 ppm for all Pb isotope ratios. With modest increases in analysis times (<10 min), external reproducibility of ≤50 ppm is attainable, e.g., SRM 981— 206 Pb/ 204 Pb=16.9418±6; ...
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