- Types:
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alpha radiation, alpha ray
the radiation of alpha particles during radioactive decay
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beta radiation, beta ray, electron radiation
radiation of beta particles during radioactive decay
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cosmic ray
highly penetrating ionizing radiation of extraterrestrial origin; consisting chiefly of protons and alpha particles; collision with atmospheric particles results in rays and particles of many kinds
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neutron radiation
radiation of neutrons (as by a neutron bomb)
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X ray, X-radiation, X-ray, roentgen ray
electromagnetic radiation of short wavelength produced when high-speed electrons strike a solid target
