Detection of Plutonium-244 in Nature

@article{Hoffman1971DetectionOP,
  title={Detection of Plutonium-244 in Nature},
  author={Darleane C. Hoffman and F. O. Lawrence and Jack L Mewherter and Frank Rourke},
  journal={Nature},
  year={1971},
  volume={234},
  pages={132-134}
}
Mass spectrometric measurements of plutonium isolated from Precambrian bastnasite confirm the presence of 244Pu in nature. Although the existence of 244Pu as an extinct radioactivity has been postulated to explain the xenon isotope ratios observed in meteorites, this is the first indication of its present existence in nature. 

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A Study on Determination of Potentially Hazardous Plutonium Isotopes in Environmental Samples

  • D. Strumińska-Parulska
  • Environmental Science
    Journal of environmental science and health. Part C, Environmental carcinogenesis & ecotoxicology reviews
  • 2013
TLDR
The concentrations of plutonium isotopes in analyzed samples indicates its measurement is of great importance for environmental and safety assessment, especially in contaminated areas.
...

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