Detection of Uranium from Cosmos-1402 in the Stratosphere

@article{Leifer1987DetectionOU,
  title={Detection of Uranium from Cosmos-1402 in the Stratosphere},
  author={Robert Leifer and Z. R. Juzdan and William R. Kelly and John D. Fassett and Keith R. Eberhardt},
  journal={Science},
  year={1987},
  volume={238},
  pages={512 - 514}
}
The nuclear reactor from the Soviet radar reconnaissance satellite, Cosmos-1402, reentered the earth's atmosphere on 7 February 1983 and disintegrated over the South Atlantic Ocean. The reactor was powered by approximately 50 kilograms of uranium-235 (235U). In an effort to determine the fate of the reactor core, a series of aerosol samples were collected at altitudes between 27 and 36 kilometers in the Northern Hemisphere approximately 1.1 years later by high-altitude balloons. At an altitude… 
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