Be-10 and Al-26 contents of eucrites - Implications for production rates and exposure ages

Details Be-10 and Al-26 contents of eucrites - Implications for production rates and exposure ages Be-10 and Al-26 contents of eucrites - Implications for production rates and exposure ages

Jun 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988gecoa..52.1691a&link_type=abstract

Geochimica et Cosmochimica Acta (ISSN 0016-7037), vol. 52, June 1988, p. 1691-1698. NSF-supported research.

Computer Science

4

Aluminum 26, Beryllium 10, Chondrites, Meteoritic Composition, Radioactive Age Determination, Argon Isotopes, Cosmic Rays, Radiation Shielding

Scientific paper

This paper presents the Be-10 contents of 20 and the Al-26 contents of nine eucrites. Most have Be-10 production rates between 16 and 26 dpm/kg. The average value of 21.8 dpm/kg agrees to within 10 percent with the value expected and does not support the suggestion that the eucrites received an unusually low flux of cosmic rays during the last few million years. Measured Be-10 and Al-26 contents are consistent with semiempirical calculations of nuclear production rates. The Al-26 contents provide a basis for computing shielding-corrected Ar-38 exposure ages of eucrites which show little evidence for clustering. Relatively more eucrites than diogenites are younger than 20 Ma.

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