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Science. 2004 Oct 1;306(5693):89-91.

Extinct 244Pu in ancient zircons.

Author information

1
Department of Earth Sciences, University of Manchester, Manchester M13 9PL, UK. grenville.turner@man.ac.uk

Abstract

We have found evidence, in the form of fissiogenic xenon isotopes, for in situ decay of 244Pu in individual 4.1- to 4.2-billion-year-old zircons from the Jack Hills region of Western Australia. Because of its short half-life, 82 million years, 244Pu was extinct within 600 million years of Earth's formation. Detrital zircons are the only known relics to have survived from this period, and a study of their Pu geochemistry will allow us to date ancient metamorphic events and determine the terrestrial Pu/U ratio for comparison with the solar ratio.

PMID:
15459384
DOI:
10.1126/science.1101014
[Indexed for MEDLINE]
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