Plutonium-244 Fission Tracks: Evidence in a Lunar Rock 3.95 Billion Years Old
- 26 May 1972
- journal article
- other
- Published by American Association for the Advancement of Science (AAAS) in Science
- Vol. 176 (4037) , 909-911
- https://doi.org/10.1126/science.176.4037.909
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 ± 10 9 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 × 10 9 years ago.Keywords
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