Other
Scientific paper
Aug 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976e%26psl..31..386g&link_type=abstract
Earth and Planetary Science Letters, vol. 31, no. 3, Aug. 1976, p. 386-392.
Other
5
Condensates, Inclusions, Meteoritic Composition, Plutonium Isotopes, Radioactive Age Determination, Uranium 238, Radioactive Isotopes, Refractory Metals, Solar System
Scientific paper
The coarse-grained, Ca-rich inclusions in the Allende meteorite are the highest-temperature condensates from the cooling solar nebula and, as such, the oldest solid objects in the solar system. All refractory elements with condensation points above the accretion temperature of the inclusions whose concentrations in them have been measured are seen to be present in the inclusions in unfractionated proportion to one another relative to Cl chondrites when data are averaged for a large number of inclusions. Observational data for U and theoretical data for both U and Pu suggest that these elements exhibited refractory behavior in the solar nebula. An experiment is proposed in which fissiogenic Xe and U contents are measured in a suite of these inclusions to obtain the Pu-244/U-238 ratio of the solar system at the time of initial condensation with an uncertainty of plus or minus 15%.
Ganapathy Rajesh
Grossman Lawrence
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