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

Journal Article · Wed Jun 01 00:00:00 EDT 1988 · Geochimica et Cosmochimica Acta; (USA)

DOI:https://doi.org/10.1016/0016-7037(88)90237-2· OSTI ID:5398834

Aylmer, D; Herzog, G F; Klein, J; Middleton, R ^[1]

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1. State Univ. of New Jersey, New Brunswick (USA)

The authors present the {sup 10}Be contents of 20 and the {sup 26}Al contents of 9 eucrites. Most have {sup 10}Be production rates between 16 and 26 dpm/kg. The average value of 21.8 dpm/kg agrees to within 10% with 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 {sup 10}Be and {sup 26}Al contents are consistent with semi-empirical calculations of nuclear production rates. The {sup 26}Al contents provide a basis for computing shielding-corrected {sup 38}Ar exposure ages of eucrites which show little evidence for clustering. Relatively more eucrites than diogenites are younger than 20 Ma.

• OSTI ID: 5398834
• Journal Information: Geochimica et Cosmochimica Acta; (USA), Vol. 52:6; ISSN 0016-7037
• Country of Publication: United States
• Language: English

Related Subjects

58 GEOSCIENCES
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
METEOROIDS
CHEMICAL COMPOSITION
COSMIC RAY FLUX
COSMIC RAY PROPAGATION
ALUMINIUM 26
BERYLLIUM 10
GEOCHEMISTRY
ISOTOPE RATIO
ALKALINE EARTH ISOTOPES
ALUMINIUM ISOTOPES
BERYLLIUM ISOTOPES
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
BETA-PLUS DECAY RADIOISOTOPES
CHEMISTRY
EVEN-EVEN NUCLEI
ISOTOPES
LIGHT NUCLEI
NUCLEI
ODD-ODD NUCLEI
RADIATION FLUX
RADIOISOTOPES
SECONDS LIVING RADIOISOTOPES
YEARS LIVING RADIOISOTOPES
580400* - Geochemistry- (-1989)
640101 - Astrophysics & Cosmology- Cosmic Radiation