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Noun: caesium 137
Usage: Brit, Cdn (US: cesium 137)
  1. A radioactive isotope of caesium used in radiation therapy
    "caesium 137 is a byproduct of nuclear fission reactions";
    - cesium 137 [N. Amer]

Type of: atomic number 55, caesium [Brit, Cdn], cesium [N. Amer], Cs

Encyclopedia: Caesium 137