Plutonium-244 Fission Tracks: Evidence in a Lunar Rock 3.95 Billion Years Old

@article{Hutcheon1972Plutonium244FT,
  title={Plutonium-244 Fission Tracks: Evidence in a Lunar Rock 3.95 Billion Years Old},
  author={Ian Douglass Hutcheon and P. Buford Price},
  journal={Science},
  year={1972},
  volume={176},
  pages={909 - 911}
}
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 x 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 X 109 years ago. 
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