Computer Science
Scientific paper
Sep 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976e%26psl..32...35b&link_type=abstract
Earth and Planetary Science Letters, vol. 32, no. 1, Sept. 1976, p. 35-39. Research supported by the Science Research Council.
Computer Science
2
Achondrites, Cosmic Rays, Meteoritic Microstructures, Particle Tracks, Abundance, Copper, Density Distribution, Iron, Metal Ions
Scientific paper
The cosmic-ray track record of the Shalka hypersthene achondrite is studied in order to estimate the preatmospheric size of this meteorite and to determine elemental abundance ratios within the Fe group of cosmic-ray particles. By examining hypersthene crystals taken from seven known depths below a fusion crust in a surviving fragment and comparing the observed track-density distribution with a theoretical model, a preatmospheric radius of 20 (+ or - 2) cm is estimated, assuming that the meteorite was originally spherical. The elemental ratios are determined by measuring the etchable lengths of fossil tracks in the crystals and then using calibration data from artificially produced heavy-ion tracks. A lower limit of 0.38 (+ or - 0.04) is obtained for the abundance ratio of Fe ions to the total of Fe-group ions in cosmic rays.
Bull Richard K.
Durrani Saeed A.
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