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Nuclear track records in the Abee enstatite chondriteA 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.
Document ID
19830040425
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Goswami, J. N.
(Physical Research Laboratory Ahmedabad, India)
Date Acquired
August 11, 2013
Publication Date
January 1, 1983
Publication Information
Publication: Earth and Planetary Science Letters
Volume: 62
Issue: 1, Ja
Subject Category
Lunar And Planetary Exploration
Accession Number
83A21643
Funding Number(s)
CONTRACT_GRANT: NSG-7121
Distribution Limits
Public
Copyright
Other

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