The long-term average of the galactic cosmic-ray iron group composition studied by the track method

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Abundance, Cosmic Rays, Lunar Rocks, Meteoritic Composition, Particle Tracks, Annealing, Feldspars, Fragmentation, Galactic Radiation, Iron Meteorites, Photomicrographs, Stony Meteorites

Scientific paper

Samples of lunar rock 75035 and of the meteorite Patwar have been investigated to study the long-term average of the galactic cosmic-ray composition by track measurements on feldspar crystals. For ion identification, the double-marking method has been applied to fossil cosmic-ray and Fe calibration tracks. The results obtained on the Patwar meteorite indicate that the 60-million-year average and the present-day cosmic-ray (Cr + Mn)/Fe abundance ratios are about equal. The lunar sample showed an enhanced abundance ratio, which probably is the result of the complex burial history of the rock. Beside the compositional data, information has been obtained on the degree of influence of annealing effects and on nuclear fragmentation parameters.

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