Cosmic ray exposure ages of iron meteorites, complex irradiation and the constancy of cosmic ray flux in the past

Details Cosmic ray exposure ages of iron meteorites, complex irradiation and the constancy of cosmic ray flux in the past Cosmic ray exposure ages of iron meteorites, complex irradiation and the constancy of cosmic ray flux in the past

Nov 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984lpico.526...25m&link_type=abstract

Press Abstracts from the Fifteenth Lunar and Planetary Science Conference, held March 12 -16, 1984, in Houston, TX. LPI Contribu

Computer Science

Chronology, Cosmic Rays, Energetic Particles, Exposure, Flux (Rate), Iron Meteorites, Irradiation, Time Measurement, Chemical Composition, Nuclear Reactions, Paleontology, Potassium, Radioactive Isotopes

Scientific paper

While previous calculations of potassium ages assumed a constant cosmic ray flux and a single stage (no change in size) exposure of iron meteorites, present calculations relaxed these constancy assumptions and the results reveal multistage irradiations for some 25% of the meteorites studied, implying multiple breakup in space. The distribution of exposure ages suggests several major collisions (based on chemical composition and structure), although the calibration of age scales is not yet complete. It is concluded that shielding-corrected (corrections which depend on size and position of sample) production rates are consistent for the age bracket of 300 to 900 years. These production rates differ in a systematic way from those calculated for present day fluxes of cosmic rays (such as obtained for the last few million years).

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