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Title:
Plutonium-244 Fission Tracks: Evidence in a Lunar Rock 3.95 Billion Years Old
Authors:
Hutcheon, I. D.; Price, P. B.
Publication:
Science, Volume 176, Issue 4037, pp. 909-911 (Sci Homepage)
Publication Date:
05/1972
Origin:
JSTOR
DOI:
10.1126/science.176.4037.909
Bibliographic Code:
1972Sci...176..909H

Abstract

Tracks attributed to the spontaneous fission of plutonium-244 and of uranium-238 were detected in a large whitlockite crystal in the lunar breccia 14321 from the Fra Mauro formation. For a track-retention age of 3.95 × 109 years the number of plutonium tracks relative to the number of uranium tracks is 0.51 ± 0.15, provided that the rock was not heavily neutron-irradiated 3.95 × 109 years ago.
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Physics
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