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High precision Os isotope ratio measurements using Phoenix X62 TIMS
Introduction The study of Osmium isotopes is an important tool in geochemistry and cosmochemistry (e.g. Shirey and Walker 1998, Brandon et al. 2006, Ravizza and Turekian 1992). Side box 1 provides background on the two Os isotope systems of interest. Whilst 187Os/188Os ratios can vary by several percent, the variation in 186Os/188Os is far smaller…