Radiation that does not cause atmospheric ionization; electrically neutral radiation.

(pathology) An acute illness caused by irradiation of the entire body by a high dose of penetrating radiation in a very short period of time.

plural of non-ionizing radiation

plural of acute radiation syndrome

(astronomy, physics) Either of two torus-shaped areas of high-energy charged particles which partly surround Earth, trapped by its magnetic field. The areas are characterised by intense radiation. When the belts "overload", particles strike the upper atmosphere and fluoresce, causing the polar aurora.

plural of Van Allen radiation belt

(archaic) Third-person singular simple present indicative form of radiate