(astronomy) All the electromagnetic radiation and subatomic particles radiated from the Sun, especially that part that reaches the Earth

(physics) electromagnetic radiation that has a frequency of about 3 to 30 GHz

(engineering) Electromagnetic waves with frequencies around one terahertz. / (engineering) Especially electromagnetic waves in the range 0.1-30 THz (or subranges there of, see T-rays or T-waves).

(physics) The radiation of beta particles as a result of radioactive decay.

(physics) The radiation of alpha particles as a result of radioactive decay.

a fog produced by the cooling of air at the ground through the release of electromagnetic energy in the form of heat

(physics) The study of the effects of ionizing radiation on matter, and of its measurement

plural of radiation dose

(physics) The amount of radiation to which something is exposed.

plural of ionizing radiation