Computer Science
Scientific paper
Nov 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979natur.282..393b&link_type=abstract
Nature, vol. 282, Nov. 22, 1979, p. 393, 394. Research supported by the Science Research Council.
Computer Science
8
Fission Products, Heavy Elements, Iron Meteorites, Meteoritic Composition, Particle Tracks, Abundance, Electron Microscopy, Lunar Core, Lunar Evolution, Meteorites, Iron Meteorites, Superheavy Elements, Models, Fission Track Analysis, Radioactivity, Heat Sources, Siderophile Elements, Trace Elements, Abundances, Isotopes, Odessa 1A Meteorite, Landes Meteorite, Brenham Pallasite, Density, Electron Microscopy, Plutonium, Particle Tracks
Scientific paper
The paper reports on a search for radiation damage tracks produced by fissioning superheavy elements along metal-silicate boundaries in IA iron meteorites and a pallasite. Track densities near the center of each grain, along a 10-micron strip adjacent to the boundary and on the interface surface of an olivine grain were measured in samples of the Odessa, Landes and Brenham meteorites. Results show no evidence of an excess of tracks in the metal-silicate boundary, suggesting an upper limit of 2000/sq cm to superheavy element fission track density for Brenham. Upper limits of 2 x 10 to the -15th kg/kg for Brenham metal and 10 to the -12th kg/kg for Odessa metal to the concentration of fissioning superheavy elements at the time when fission track retention began are estimated from the actual measured track densities.
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