The process whereby radiant energy is propagated through space or matter is called:

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The term "radiation" refers to the transfer of energy through space or matter in the form of waves or particles. This can include electromagnetic radiation like visible light or X-rays, as well as particles like alpha or beta particles. "Ion" refers to an atom or molecule that has gained or lost one or more electrons and has a net electric charge, while "radiograph" refers to an image produced by radiation (often X-rays) passing through an object. "Irradiation" refers to the process of exposing an object or material to radiation.

The Process Whereby Radiant Energy Is Propagated Through Space or Matter