Angra DOS Reis - Plutonium distribution and cooling history

Details Angra DOS Reis - Plutonium distribution and cooling history Angra DOS Reis - Plutonium distribution and cooling history

Jun 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977e%26psl..35..285s&link_type=abstract

Earth and Planetary Science Letters, vol. 35, no. 2, June 1977, p. 285-293. Research supported by the Delegation Generale a la

Physics

8

Cooling, Cosmic Rays, Feldspars, Particle Tracks, Plutonium, Case Histories, Fossils, Microstructure, Minerals, Olivine, Pyroxenes, Temperature Effects

Scientific paper

The preatmospheric mass of Angra dos Reis is estimated to be about 80 kg, based on cosmic ray track densities of 1 to 3 x 10 to the sixth/sq cm in feldspars, olivines, and pyroxenes. The Pu-244 fission track densities in pyroxenes and adjacent olivine-feldspar track detectors, as well as in whitlockites and adjacent pyroxene-olivine detectors, are about 20 and 280 x 10 to the sixth/sq cm, respectively. These values correspond exactly to the Pu-244 fission xenon contents in the two minerals. This suggests an almost instantaneous cooling (greater than 70 K per million years) of the Angra dos Reis material 4.55 billion years ago. This fast cooling is the reason for a quantitative He-4 retention since that time. If the He-4 excess found in Angra dos Reis is a real effect, the source of this excess remains unknown.

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