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

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

Encyclopedia: Cesium 137