Understudy definition, to learn (a role) in order to replace the regular actor or actress when necessary. See more.
Radiation. radiation. (Science: radiobiology) propagation of energy through space. In the context of this report, it is electromagnetic radiation (x-rays or gamma rays) or corpuscular radiation (alpha particles, electrons, protons, neutrons) capable of producing ionisation.adiation. radiation. (Science: radiobiology) propagation of energy through space. In the context of this report, it is electromagnetic radiation (x-rays or gamma rays) or corpuscular radiation (alpha particles, electrons, protons, neutrons) capable of producing ionisation.
Definition of radiation. 1  1a : the action or process of radiatingb : the process of emitting radiant energy in the form of waves or particlesc (1) : the combined processes of emission, transmission, and absorption of radiant energy (2) : the transfer of heat by radiation â compare conduction, convection.