Tritium concentration in ocean

@article{Kakiuchi1999TritiumCI,
  title={Tritium concentration in ocean},
  author={Hideki Kakiuchi and Noriyuki Momoshima and Tomio Okai and Yonezo Maeda},
  journal={Journal of Radioanalytical and Nuclear Chemistry},
  year={1999},
  volume={239},
  pages={523-526}
}
Surface seawater and water vapor about 10 m above the sea level were collected in the Pacific and Indian Oceans during the expedition of KH-96-5 to examine tritium concentrations in open sea. The tritium concentration in the water vapor was one order of magnitude higher than that in the surface seawater, attributed to downward movement of naturally occurring tritium from stratosphere to troposphere. 
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