Cosmic-ray-induced fission of heavy nuclides - Possible influence on apparent U-238-fission track ages of extraterrestrial samples

Details Cosmic-ray-induced fission of heavy nuclides - Possible influence on apparent U-238-fission track ages of extraterrestrial samples Cosmic-ray-induced fission of heavy nuclides - Possible influence on apparent U-238-fission track ages of extraterrestrial samples

Aug 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978e%26psl..40..439d&link_type=abstract

Earth and Planetary Science Letters, vol. 40, no. 3, Aug. 1978, p. 439-444. Research supported by the Bundesministerium für For

Computer Science

Cosmic Rays, Lunar Rocks, Nuclear Fission, Particle Tracks, Uranium 238, Abundance, Fission Products, Lunar Surface, Radioactive Age Determination, Cosmic Rays, Uranium, Samples, Terrestrial, Nuclides, Fission, Surface, Isotopes, Minerals, Meteorites, Lunar, Chemical Composition, Particle Flux, Fossil Tracks

Scientific paper

The rates of cosmic-ray-induced fission of U, Th, Bi, Pb, and Au in mineral samples as a function of burial depth in the lunar surface layer are calculated using available experimental particle flux and cross-section data. Theoretical correction factors are given for apparent fission track ages of extraterrestrial samples of different burial depths which were exposed to cosmic rays for various time fractions of their solidification age. Samples having typical lunar heavy element contents can yield apparent fission track ages which are too high by a factor of up to approximately 13 due to cosmic-ray-induced fission. The interference may be neglected, if the ratio of exposure age to solidification age remains less than approximately 0.005. The calculations show that the induced fission of Bi, Pb, and Au (which are known to have high meteoritic abundances) may dominate spontaneous U-238-fission in longtime exposed meteorites of low U and Th contents.

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