Nuclear track study of Jilin chondrite

Details Nuclear track study of Jilin chondrite Nuclear track study of Jilin chondrite

Feb 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985e%26psl..72..286p&link_type=abstract

Earth and Planetary Science Letters (ISSN 0012-821X), vol. 72, no. 2-3, Feb. 1985, p. 286-298. Research supported by the Institu

Astronomy and Astrophysics

Astronomy

21

Chondrites, Cosmic Rays, Meteoritic Composition, Olivine, Particle Tracks, Radioactive Age Determination, Argon Isotopes, Chemical Composition, Cobalt 60, Density Distribution, Fission Products, Mineralogy, Neon Isotopes, Uranium 238, Meteorites, Jilin, H5 Chondrites, Stone Meteorites, Samples, Meteorite, Nuclear Tracks, Neon 21, Concentration, Olivine, Density, Irradiation, Shielding?, Cosmic Rays, Nuclei, Source, Exposure, Temperature, Depth, Cobalt, Fission, Mass, Comparisons, Thermal Effects

Scientific paper

Attention is given to nuclear track records in olivines from 21 specimens of Jilin which sample the whole spectrum of Ne-21 concentrations and come from both the main mass and the strewn fragments. Although 19 of the specimens exhibit extremely low track densities, two which have high Ne-21 contents and the largest Ar-40 and He-4 losses are found, and noted to have track densities of about 750 and 1500/sq cm. These tracks are attributed to very heavy cosmic ray nuclei. These results may be explained in terms of production during the first stage exposure, or during the second irradiation stage of 0.4 Myr. The ubiquitous presence of a track density background in most samples is best explained by the spontaneous fission of U-238 since 4.0 Gyr.

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