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Techniques have been developed for ion microprobe Pb-isotope dating of minerals at a lateral scale <5μm using the Cameca NanoSIMS 50. Probe spots 3–5μm in diameter comprising 16keV 16 O − ions were utilized in the analyses by magnetic peak-switching of 204 Pb + , 206 Pb + , 207 Pb + , and 208 Pb + in NIST SRM 981 and...
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