Other
Scientific paper
Aug 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989gecoa..53.2095j&link_type=abstract
Geochimica et Cosmochimica Acta (ISSN 0016-7037), vol. 53, Aug. 1989, p. 2095-2100.
Other
23
Antarctic Regions, Carbon 14, Galactic Cosmic Rays, Meteoritic Composition, Aluminum Isotopes, Chemical Composition, Earth Surface, Krypton Isotopes, Meteorites, Antarctic Meteorites, Carbon 14, Isotopes, Samples, Meteorite, Laboratory Studies, Procedure, Bruderheim, L6 Chondrites, Techniques, Catalog, Terrestrial Age
Scientific paper
This paper reports C-14 measurements in meteorites using an extraction method which employs RF melting of samples as small as 0.1 g. A study of extraction of cosmic-ray-produced C-14 in samples of Bruderheim gave C-14 levels between 38 and 60 dpm/kg for samples which had been preheated in air between 250 and 700 C, with a mean value of 46.8 + or - 1.4 dpm/kg. A range of values between 35 and 59 dpm/kg was found for other falls of saturated meteorites preheated to 500 C. The preheating step is shown to be effective in removing terrestrial carbon contamination. A series of samples previously dated by Kr-81 as having ages of 120-310 kyr gave C-14 levels of between less than 0.16 and 0.37 + or - 0.10 dpm/kg. These levels are consistent with levels of in situ production by cosmic rays at the earth's surface.
Donahue Douglas J.
Linick T. W.
Timothy Jull A. J.
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