Other
Scientific paper
Apr 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980georl...7..275c&link_type=abstract
Geophysical Research Letters, vol. 7, Apr. 1980, p. 275-278.
Other
10
Abundance, Basalt, Chondrites, Meteoritic Composition, Uranium 235, Uranium 238, Mass Ratios, Meteorites, Chondrites, Uranium, Isotopic Ratios, Procedure, Data, Samples, Meteorite, Spectrum, Comparisons, Basalts, Catalogs, Lead, Composition, Mass Spectrometry, Experiments, Analysis, Isotopes, Contamination, Abundance, Dhajala Meteorite, Pultusk Meteorite, Richardton Meteorite, Bruderheim Meteorite, Allende Meteorite, St. Severin Meteorite, Leedey Meteorite, Barwell Meteorite
Scientific paper
The U-238/U-235 ratios for nine bulk chondritic meteorites and a terrestrial basalt were measured. The total range in U-238/U-235 determined for both total meteorites and for acid leaches was from 137.2 terrestrial U. The typical errors in a single determination are plus or minus 6 per thousand (2 sigma m) for a 2 ng U sample from a chondrite. Taking the extreme values of delta U-235 for each measurement the maximum amount of excess U-235 that can be allowed to be present ranges from 200 million to 2 billion atoms per gram of bulk meteorite. These results do not support the claims of variations in U-238/U-235 at the percentage levels or number of excess U-235 atoms in some of the same meteorites as reported by several other previous workers.
Chen Jacqueline H.
Wasserburg Gerald J.
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