Metrology and traceability of U-Pb isotope dilution geochronology (EARTHTIME Tracer Calibration Part I)
作者： D.J. Condon , B. Schoene , N.M. McLean , S.A. Bowring , R.R. Parrish
DOI: 10.1016/J.GCA.2015.05.026
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摘要: Abstract Mixed 235U–233U–205Pb(–202Pb) tracers for U–Pb isotope-dilution isotope ratio mass spectrometry have been prepared under the auspices of EARTHTIME Initiative. The methods and results preparation calibration U/Pb isotopic abundances are given, various sources uncertainty discussed quantified. accuracy tracer composition can be traced back to SI units via a series assay reference materials combined with experiments described herein. parameters used in calculating ratios (and inferentially dates) correlated uncertainties that result total contribution 206Pb/238U dates ±
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