C-14 content of ten meteorites measured by tandem accelerator mass spectrometry

Details C-14 content of ten meteorites measured by tandem accelerator mass spectrometry C-14 content of ten meteorites measured by tandem accelerator mass spectrometry

Jan 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984e%26psl..67....1b&link_type=abstract

Earth and Planetary Science Letters (ISSN 0012-821X), vol. 67, no. 1, Jan. 1984, p. 1-8.

Computer Science

12

Carbon 14, Mass Spectroscopy, Meteoritic Composition, Accelerators, Antarctic Regions, Carbon Dioxide, Cosmic Rays, Meteorites, Samples, Meteorite, Carbon 14, Abundance, Composition, Tams, Spectrometry, Catalog, Antarctic Meteorites, Cosmogenic Elements, Mass, Procedure, Terrestrial Ages, Bruderheim, Yamato 7304, Estacado, Carbon, Allan Hills Meteorites, Parameters, Cosmic Rays, Silicate, Altitude, Weathering, Carbon Dioxide, Absorption, Production Rate

Scientific paper

Measurements of C-14 in three North American and seven Antarctic meteorites show in most cases that this cosmogenic isotope, which is tightly bound, was separated from absorbed atmospheric radiocarbon by stepwise heating extractions. The present upper limit to age determination by the accelerator method varies from 50,000 to 70,000 years, depending on the mass and carbon content of the sample. The natural limit caused by cosmic ray production of C-14 in silicate rocks at 2000 m elevation is estimated to be 55,000 + or - 5000 years. An estimation is also made of the 'weathering ages' of the Antarctic meteorites from the specific activity of loosely bound CO2 which is thought to be absorbed from the terrestrial atmosphere. Accelerator measurements are found to agree with previous low level counting measurements, but are more sensitive and precise.

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