Al-26 and Be-10 production in iron meteorites

Details Al-26 and Be-10 production in iron meteorites Al-26 and Be-10 production in iron meteorites

Apr 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988e%26psl..88..107a&link_type=abstract

Earth and Planetary Science Letters (ISSN 0012-821X), vol. 88, no. 1-2, April 1988, p. 107-118. NSF-supported research.

Computer Science

23

Aluminum 26, Beryllium 10, Iron Meteorites, Meteoritic Composition, Radioactive Age Determination, Abundance, Cosmic Rays, Mass Spectroscopy, Stony Meteorites, Meteorites, Iron Meteorites, Aluminum 26, Beryllium 10, Production Rates, Mass Spectrometry, Laboratory Studies, Samples, Meteorite, Cosmic Rays, Abundance, Catalog, Nuclides, Isotopic Ratios, Exposure Age, Procedure, Dating Methods, Analysis, Shielding, Rare Gases, Stony Meteorites, Age, Intensity, Calculations, Terrestrial Age

Scientific paper

To compare the Al-26/Ne-21 ages with K-40/K-41 ages, the contents of Al-26 were determined in seven iron meteorites using accelerator mass spectrometry and the light noble gas contents were determined using conventional mass spectrometry, for samples for which these values were not available. In addition, contents of Be-10 were measured. Due to the presence of boron in the samples, the values of Al-26 were found to be at least 30 percent lower than the literature values obtained by low-level counting techniques, while the Be-10 values were 10-15 percent lower. The production rates of these nuclides at different He-4/Ne-21 ratios were estimated, showing that the increase in He-4/Ne-21 ratios corresponded with decreases in Al-26 and Be-10. It was shown that the exposure ages calculated from the Ne-21/Al-26 ratio cannot be calibrated so as to agree with both the K-40/K-41 ages and ages based on the shorter-lived nuclides Ar-39 and Cl-36.

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