American Heritage® Dictionary of the English Language, Fourth Edition
- n. Electromagnetic radiation emitted by radioactive decay and having energies in a range from ten thousand (104) to ten million (107) electron volts.
- n. Very high frequency (and therefore very high energy) electromagnetic radiation emitted as a consequence of radioactivity.
GNU Webster's 1913
- n. (Physics) A very penetrating electromagnetic ray not appreciably deflected by a magnetic or electric field, emitted by radioactive substances.
Gamma raysare photons of electromagnetic radiation having a wavelength shorter than that of X-rays, (i. e. shorter than 0.1 nanometer) and are correspondingly more penetrating than X-rays. In addition to being given off in certain types of radioactive decay, they may be found in cosmic radiation, though they are largely absorbed by the earth's atmosphere. Gamma-ray detectors orbited above the atmosphere have found bursts of gamma radiation, in some cases associated with visually observed supernova explosions, but in most cases from unidentified sources.
- n. electromagnetic radiation emitted during radioactive decay and having an extremely short wavelength
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The collocations below consist of nouns only. Noun-noun collocations are extremely frequent in science (just think of the names of species, chemical compounds or "scientist+invention" type collocat...
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