Computer Science
Scientific paper
Jan 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981e%26psl..52...39m&link_type=abstract
Earth and Planetary Science Letters, vol. 52, no. 1, Jan. 1981, p. 39-54.
Computer Science
19
Chondrites, Solar Orbits, Thermoluminescence, Atmospheric Entry, Orbital Elements, Temperature Gradients, Catalogs, Diagrams, Comparisons, Decay, Nuclides, Diffusion, Data, Isotopic Ratios, Helium/Neon, Analysis, Elenovka Meteorite, Heating, Ochansk Meteorite, Meteorites, Orbits, Thermoluminescence, Models, Chondrites, Pribram Meteorite, Lost City Meteorite, Innisfree Meteorite, Perihelion, Albedo, Rotation, Temperatures, Gradients, Meteoroids, Farmville Meteorite, Malakal Meteorite, Magnitude, Equipment, P
Scientific paper
The thermoluminescence levels of 45 ordinary chondrites are measured in order to provide information on the orbital characteristics of the meteorites before impact. Glow curves of the photon emission response of powdered samples of the meteorites to temperatures up to 550 C in the natural state and following irradiation by a laboratory test dose of 110,000 rad were obtained as functions of terrestrial age and compared to those of samples of the Pribram, Lost City and Innisfree meteorites, for which accurate orbital data is available. The thermoluminescence levels in 40 out of 42 meteorites are found to be similar to those of the three control samples, indicating that the vast majority of ordinary chondrites that survive atmospheric entry have perihelia in the range 0.8-1 AU. Of the remaining two, Farmville is observed to exhibit an unusually large gradient in thermoluminescence levels with sample depth, which may be a result of a temperature gradient arising in a slowly rotating meteorite. Finally, the thermoluminescence measured in the Malakal meteorite is found to be two orders of magnitude lower than control samples, which is best explained by thermal draining by solar heating in an orbit with a perihelion distance of 0.5 to 0.6 AU.
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