#radioactive_material__radioactivematerial  material that is radioactive
  supertype:  material.substance__stuff  the tangible substance that goes into the makeup of a physical object; "coal is a hard black material"; "wheat is the stuff they use to make bread"
  subtype:  radioactive_waste__radioactivewaste  useless radioactive materials that are left after some laboratory or commercial process is completed
     subtype:  high-level_radioactive_waste  radioactive waste that left in a nuclear reactor after the nuclear fuel has been consumed
     subtype:  low-level_radioactive_waste__lowlevelradioactivewaste  radioactive waste consisting of objects that have been briefly exposed to radioactivity (as in certain medical tests)

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