Abstract
A method of mass spectrometric isotope dilution analysis for the poly-isotopic rare-earth elements (REE) is described, involving use of a triple-filament assembly. The method eliminates the need for chemical separation of the REE into groups, yet provides reproducibility of Sm/Nd to ∼ 0.1% and of Eu/Eu★ to ∼ 1%. All poly-isotopic REE except Lu may be analysed to high precision within 3 hr., and the method is easily fully automated on computer-controlled mass spectrometers.
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