Exposure history of individual cosmic particles

Details Exposure history of individual cosmic particles Exposure history of individual cosmic particles

Jun 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991e%26psl.104..315n&link_type=abstract

Earth and Planetary Science Letters (ISSN 0012-821X), vol. 104, no. 2-4, June 1991, p. 315-324.

Physics

26

Galactic Cosmic Rays, Geochronology, Sedimentary Rocks, Solar Cosmic Rays, Spherules, Stony Meteorites, Aluminum Isotopes, Asteroids, Beryllium Isotopes, Greenland, Land Ice, Paleomagnetism

Scientific paper

Cosmogenic Be-10 and Al-26 were measured in a suite of stony cosmic spherules derived from deep-sea sediments and the Greenland ice cap. These spherules show clear evidence of exposure to galactic cosmic ray and solar cosmic ray bombardment on time scales from a few times 100,000 years up to as much as 10 to the 7th years. The exposure took place in the inner solar system, not in highly eccentric orbits. When they reached the earth, the particles were not much larger than their present size, but it is not excluded that most of their cosmic ray exposure took place very close to the surface of an asteroidal body.

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