Cosmogenic Records in Efremovka CV3 Meteorite

Details Cosmogenic Records in Efremovka CV3 Meteorite Cosmogenic Records in Efremovka CV3 Meteorite

Mar 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996lpi....27..923m&link_type=abstract

Lunar and Planetary Science, volume 27, page 923

Physics

2

Age: Exposure, Cosmogenic Nuclides, Gases: Noble, Neutron Effects, Nuclear Tracks

Scientific paper

Cosmic ray produced noble gas, radionuclide and nuclear track records have been studied in the CV3 meteorite Efremovka. A 21Ne exposure age of 11.4 +/- 1.7 Ma and a pre-atmospheric radius of 20 cm are obtained. Saturation activities of 10Be, 26Al and 36Cl are similar to chondritic values and consistent with the deduced size and a simple cosmic ray exposure of Efremovka meteorite. The measured 36Cl activity of 11.5 dpm/kg can at best have ~20% contribution from in situ neutron produced 36Cl and suggest that the neutron fluence experienced by Efremovka is almost an order of magnitude less than that by Allende.

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