Computer Science
Scientific paper
Mar 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977rspta.285..593k&link_type=abstract
(Royal Society, Discussion on the Moon - A New Appraisal from Space Missions and Laboratory Analyses, London, England, June 9-12
Computer Science
1
Abundance, Chromium, Cosmic Rays, Iron, Lunar Soil, Particle Tracks, Feldspars, Ferric Ions, Heavy Ions, Pyroxenes
Scientific paper
Techniques for identifying very heavy cosmic-ray ions from their etchable tracks in minerals are described, and the current status of investigations into the Cr/Fe abundance ratio of ancient cosmic rays is discussed. Results are reported for a direct comparison of fossil cosmic-ray and Fe-calibration tracks in pyroxenes of lunar rock samples. An abundance ratio of about 0.7 to 0.8 is estimated for the ancient cosmic-ray Cr group (V, Cr, Mn) relative to Fe, which is significantly higher than the generally accepted present-day ratio of about 0.2 to 0.4 for energies between 50 and 800 MeV/n. Track data obtained with pyroxenes from different lunar soil samples are interpreted by assuming that the ancient ratio of the Cr group to Fe varied between 0.4 and 0.8. It is concluded that either a long-term change took place in the composition of cosmic rays or the exposure histories of lunar samples are much more complex than assumed.
Gentner W.
Kraetschmer Wolfgang
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