gamma radiation

noun

1. electromagnetic radiation emitted by atomic nuclei; the wavelength is generally in the range 1 × 10 ^–10to 2 × 10 ^–13metres
2. 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 ^–11metres

gamma radiation

1. The most energetic radiation in the electromagnetic spectrum ; it has the lowest wavelength and the highest frequency in the spectrum. Gamma rays are sent out by some radioactive nuclei . Unlike alpha radiation and beta radiation , gamma rays are not made up of particles, and they have no charge .