A device that measures radiant energy.

(physics, chemistry, medicine) A radioactive isotope which, when injected into a chemically similar substance, or artificially attached to a biological or physical system, can be traced by radiation detection devices.

material settling from a radioactive plume, and its subsequent surface deposition

(astronomy) A technique that uses radar echoes to examine bodies within the solar system, obtaining information about size, shape, topography, surface density, spin etc.

wireless telegraphy

To communicate or transmit by wireless telegraphy.

Alternative spelling of radicalization

(transitive) To make radical. / (intransitive) To become radical; to adopt a radical political stance.

the process of radicalizing

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