- the process in which energy is emitted as particles or waves.
- the complete process in which energy is emitted by one body, transmitted through an intervening medium or space, and absorbed by another body.
- the energy transferred by these processes.
Origin of radiation
Examples from the Web for radiation
He was very familiar with the reality of what could happen: Tokyo could be covered with a really high dosage of radiation.
Everything serene, snow piling on trees, over lawns, on houses, before we realize that all the snow is poisoned with radiation.
The 4M craft also includes a radiation dosimeter built by the Spanish company iC-Málaga.Luxembourg and China Team Up on Private Mission to the Moon|Matthew R. Francis|October 26, 2014|DAILY BEAST
She said that whenever she came into the room, she had felt the radiation of a vast and unseen force.
Those Chinese reports also talked about radiation deaths in Chicago.
Attention is here drawn once more to the antagonistic reactions of temperature and radiation effects of heat.Life Movements in Plants|Sir Jagadis Chunder Bose
There is also a significant amount of radiation characteristic of uranexite.Masters of Space|Edward Elmer Smith
Rip watched his dosimeter climb steadily as the radiation dosage mounted.Rip Foster in Ride the Gray Planet|Harold Leland Goodwin
Symptoms of radiation sickness may not be noticed for several days.In Time Of Emergency|Department of Defense
The worst wounded had less than half a face, and that discolored by purple blotches of radiation scar-tissue.Mr. President|Stephen Arr
British Dictionary definitions for radiation
- the emission or transfer of radiant energy as particles, electromagnetic waves, sound, etc
- the particles, etc, emitted, esp the particles and gamma rays emitted in nuclear decay
Word Origin and History for radiation
mid-15c., "act or process of radiating," from Middle French radiation and directly from Latin radiationem (nominative radiatio) "a shining, radiation," noun of action from past participle stem of radiare "to beam, shine, gleam; make beaming," from radius "beam of light; spoke of a wheel" (see radius). Meaning "rays or beams emitted" is from 1560s. Meaning "divergence from a center" is 1650s.
Medicine definitions for radiation
Science definitions for radiation
- Streams of photons, electrons, small nuclei, or other particles. Radiation is given off by a wide variety of processes, such as thermal activity, nuclear reactions (as in fission), and by radioactive decay.
- The emission or movement of such particles through space or a medium, such as air. See Notes at conduction electromagnetic radiation.