Endemic Ru Isotopic Anomalies in Iron Meteorites and in AllendeSmall variations for Mo isotopes have been observed recently in the Allende meteorite and in iron meteorites, mesosiderites, and pallasites, using ICPMS. Large effects for Mo have been reported for leaches of Orgueil and in SiC and graphite from Murchison. Variations for Mo in bulk Allende and in Murchison have also been presented by NTIMS. Effects in Ru isotopes can define further the preserved exotic r, s, and p contributions in this mass region, and possible effects in Ru-98 and Ru-99 from Tc-98 (4.2 Ma half-life) and Tc-99 (0.21 Ma half-life). Previous attempts at determination of Ru isotopes yielded no resolved effects. The present work represents a substantial improvement in precision over the earlier work. Chemical and mass spectrometric analytical techniques are presented to determine the Ru isotope compositions in terrestrial standards and in meteorites.
Document ID
20030110700
Acquisition Source
Headquarters
Document Type
Conference Paper
Authors
Chen, J. H. (Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Papanastassiou, D. A. (Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Wasserburg, G. J. (California Inst. of Tech. Pasadena, CA, United States)