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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References

SHOWING 1-10 OF 14 REFERENCES
Plutonium-244: Confirmation as an Extinct Radioactivity
TLDR
The mass spectrum of xenon from spontaneous fission in a laboratory sample of plutonium-244 is precisely what meteoriticists predicted it would be, and the search for an explanation for anomalous fission-like xenon in carbonaceous chondrites can now be narrowed.
Uranium Distribution in Rocks by Fission-Track Registration in Lexan Plastic
TLDR
Positive, rapid location of uranium-bearing phases in the rock and accurate determination of uranium abundances are determined through a print formed on the plastic surface after chemical etching.
FISSIOGENIC XENON FROM THE PASAMONTE METEORITE
Unambiguous evidence for fission-produced nuclides in meteorites has been shown in the abundance pattern of the Xe isotopes from the Pasamonte meteorite. Calculation of the age of the meteorite from
Tracks of heavy primary cosmic rays in meteorites
Tracks of primary cosmic rays with atomic number ≳20 have been identified in 23 out of 42 meteorites of various types. They satisfy the criteria of rapid attenuation with depth, directional
The abundance of244Pu in the early solar system
...
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