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  • High energy particles or rays emitted during the nuclear decay processes.
  • (ionizing radiation) Alpha particles, beta particles, gamma rays, x-rays, neutrons, high-speed electrons, high-speed protons, and other particles capable of producing ions. Radiation does not include non-ionizing radiation, such as radio- or microwaves, or visible, infrared, or ultraviolet light. Source: U.S. Nuclear Regulatory Commission