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1. (Nuclear Physics) electromagnetic radiation emitted by atomic nuclei; the wavelength is generally in the range 1 × 10–10 to 2 × 10–13 metres
2. (General Physics) electromagnetic radiation of very short wavelength emitted by any source, esp the portion of the electromagnetic spectrum with a wavelength less than about 1 × 10–11 metres
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|Noun||1.||gamma radiation - electromagnetic radiation emitted during radioactive decay and having an extremely short wavelength|
electromagnetic radiation, electromagnetic wave, nonparticulate radiation - radiation consisting of waves of energy associated with electric and magnetic fields resulting from the acceleration of an electric charge
electromagnetic spectrum - the entire frequency range of electromagnetic waves