The Xenon Record of Extinct Radioactivities in the Earth

Details The Xenon Record of Extinct Radioactivities in the Earth The Xenon Record of Extinct Radioactivities in the Earth

Dec 1971

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1971sci...174.1334b&link_type=abstract

Science, Volume 174, Issue 4016, pp. 1334-1336

Computer Science

20

Scientific paper

Analyses of xenon from well gas rich in carbon dioxide reveal a large excess of radiogenic xenon-129 from the decay of extinct iodine-129. Smaller excesses observed in the heavy xenon isotopes are from fission. These results place narrow limits on any age difference between the earth and the oldest meteorites. The occurrence of excess radiogenic xenon-129 in well gas also suggests that any quantitative degassing of existing solid materials to form the atmosphere must have been limited to a very early period of the earth's history, approximately the first 108 years. Alternatively, this observation is consistent with a model of the earth's continuous, but still incomplete, degassing since its time of formation.

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