Other
Scientific paper
Apr 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991e%26psl.103...79k&link_type=abstract
Earth and Planetary Science Letters (ISSN 0012-821X), vol. 103, no. 1-4, April 1991, p. 79-83. NASA-supported research.
Other
10
Antarctic Regions, Calcium Isotopes, Half Life, Mass Spectroscopy, Meteoritic Composition, Chlorine, Geochronology, Nuclides
Scientific paper
Accelerator mass spectrometry is utilized to determine the half-life of Ca-41 from the decrease of its concentration with terrestrial age in five Antarctic meteorites and a recent fall. The meteorites were selected on the basis of their Cl-36 concentrations, which showed a span of terrestrial ages of about 600 ka, and on the basis of other cosmogenic nuclide concentrations which indicated that the meteorites had small preatmospheric sizes, and sufficiently long irradiation times in space that the concentrations of Ca-41 and Cl-36 were in secular equilibrium prior to the meteorites' fall to earth. The half-life of Ca-41 is determined at 103 + or - 7 ka. Topics discussed include the effects of undersaturation (short exposure time in space), shielding (the samples are from the interior of a large meteorite), and weathering on the cosmogenic nuclide concentrations in meteorites.
Arnold James
Fink David
Klein Jeffrey
Middleton Roy
Nishiizumi Kunihiko
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