Cosmogenic Ne-21 and Ne-22 depth profiles in chondrites

Details Cosmogenic Ne-21 and Ne-22 depth profiles in chondrites Cosmogenic Ne-21 and Ne-22 depth profiles in chondrites

Mar 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982e%26psl..58..116b&link_type=abstract

Earth and Planetary Science Letters, vol. 58, no. 1, Mar. 1982, p. 116-128.

Mathematics

26

Chondrites, Meteoritic Composition, Neon Isotopes, Particle Production, Particle Size Distribution, Solar Activity Effects, Galactic Radiation, Particle Tracks, Solar Cosmic Rays, Solar Flares, Meteorites, Chondrites, Cosmogenic Elements, Neon 21, Neon 22, Size, Depth Profiles, Production Rate, Meteoroids, Spallation, Solar Flares, Cosmic Rays, Composition, Radii, Irradiation, Procedure, H Chondrites, Mathematical Models, Data, L Chondrites, Ll Chondrites, Comparisons, Exposure Age, History, Parent Bodies,

Scientific paper

The production rate profiles of Ne-21 and Ne-22 as a function of depth in meteoroids due to spallation by solar flare cosmic rays (SCR) and galactic cosmic rays (GCR) are calculated and their dependence on size and composition of meteoroids has been evaluated. The GCR production rate at a given depth increases with size for radii less than approximately 25 cm and then decreases whereas the Ne-22/Ne-21 ratio (NeR) generally decreases with size and depth. The calculated GCR production rates and NeR are consistent with the measurements in several chondrites. A plot of track production rate vs. NeR shows that some chondrites have NeR values smaller than those expected for their sizes. This observation suggests at least a two-stage irradiation for such meteorites; the meteoroid exposure as a small body in the interplanetary space must have been preceded by exposure under deep shielding, possibly in its parent body.

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