radium

noun
ra*di*um \ ˈrā-dē-əm \
1898
  • an intensely radioactive metallic chemical element that occurs in combination in minute quantities in minerals (such as pitchblende or carnotite), emits alpha particles and gamma rays to form radon, and is used chiefly in the treatment of cancer and in radiographic devices

radium therapy

noun
radium therapy \
1904
  • radiotherapy
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