Computer Science
Scientific paper
Aug 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986gecoa..50.1593e&link_type=abstract
Geochimica et Cosmochimica Acta (ISSN 0016-7037), vol. 50, Aug. 1986, p. 1593-1598. Research supported by the Alexander von Humb
Computer Science
2
Chondrites, Cosmic Rays, Meteoritic Composition, Radioactive Isotopes, Rare Gases, Aluminum 26, Beryllium 10, Manganese Isotopes, Neon Isotopes, Particle Tracks
Scientific paper
The radionuclides Be-10, Al-26, and Mn-53, the noble gas isotopic composition of He, Ne, and Xe, and cosmic-ray particle track densities were determined in six documented samples of a large fragment of the Dhurmsala meteorite fall. Using the Ne-22/Ne-21 ratios and the Ne-21 concentrations, the cosmic-ray exposure age of Dhurmsala is deduced to be 13.0 + or - 1.0 My. The results suggest a simple exposure history. The six samples covering a distance of about 13 cm do not show any significant isotopic variations due to depth effects, as expected in a large meteorite. Consistent with the model calculations of Reedy (1985) and Bhandari and Potdar (1982), the results obtained in this study indicate that the Dhurmsala samples investigated here originate at a depth of about 20 to 24 cm in a meteoroid with a preatmospheric radius of R approximately equal to 50 cm.
Englert Peter
Herpers Ulrich
Padia J. T.
Rao Mallikharjuna N.
Sarafin R.
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