An Etymological Dictionary of Astronomy and Astrophysics

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فرهنگ ریشه‌شناختی اخترشناسی-اخترفیزیک

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radioactivity
  پرتو-ژیرایی، پرتو-ژیرندگی  
partow-žirâyi, partow-žirandegi
Fr.: radioactivité  

The spontaneous disintegration of certain atomic nuclei, which is accompanied by the emission of either α- or β- particles and/or a γ rays.

See also: → radio; → activity.