Computer Science
Scientific paper
Jan 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983e%26psl..62..159g&link_type=abstract
Earth and Planetary Science Letters, vol. 62, no. 1, Jan. 1983, p. 159-164.
Computer Science
3
Chondrites, Enstatite, Meteoritic Microstructures, Nuclear Particles, Particle Tracks, Ablation, Atmospheric Entry, Cosmic Rays, Density Distribution, Fission, Grain Boundaries, Mass, Radiation Dosage, Size (Dimensions), Meteorites, Abee Meteorite, Enstatites, E4 Chondrites, Nuclear Tracks, Samples, Meteorite, Cosmic Rays, Exposure Age, History, Density, Origin, Compaction Age, Analysis, Ablation, Mass, Experiments, Procedure, Diagrams, Photographs, Size, Data, Fission, Irradiation
Scientific paper
A determination of preatmospheric mass and a delineation of cosmic ray exposure history are made, through the study of nuclear track records in 14 samples taken from different locations of an Abee enstatite chondrite cut slab. Measured track densities in different samples range from 10,000 to 1,000,000/sq cm. Excess tracks of fissiogenic origin were found near the grain edges and across cleavage planes in eight enstatite grains out of the 300 analyzed. The track data rule out preirradiation of any of the analyzed samples with shielding of less than a few tens of cm. The isotrack density contours on the plane of the slab imply an asymmetric ablation of the Abee chondrite during its atmospheric transit. A sphere of about 30 cm radius approximates the preatmospheric shape and size of the Abee meteorite, which underwent a 70% mass loss during ablation.
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