Computer Science
Scientific paper
Aug 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978gecoa..42.1075r&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 42, Aug. 1978, p. 1075-1090.
Computer Science
82
Abundance, Calcium Isotopes, Chemical Fractionation, Geochemistry, Lunar Composition, Meteoritic Composition, Isotope Separation, Mass Ratios, Mass Spectroscopy, Solar System, Calcium, Isotopes, Fractionation, Earth, Solar System, Isotopic Ratios, Spectrometers, Samples, Lunar, Meteorites, Terrestrial
Scientific paper
Isotopic abundance measurements of calcium in meteoritic, lunar, and terrestrial samples are reported. Differences in the Ca-40/Ca-44 ratio due to mass dependent isotope fractionation in nature are resolvable to a level of 0.0005 by use of the double-spike technique, application of the mass-dependent law for correction of instrumental mass fractionation, and elimination of fractionation effects identified as due to differential elution of isotopes through ion exchange resins. No samples of natural materials are found to have Ca fractionated by more than 0.25% for Ca-40/Ca-44. The reason for the homogeneity is not known.
Papanastassiou Dimitri Anastassios
Russell W. A.
Tombrello T. A.
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