actinism

noun actinism

• cathode rays — a stream of electrons emitted from the surface of a cathode in a valve
• fluoroscope — a tube or box fitted with a screen coated with a fluorescent substance, used for viewing objects, especially deep body structures, by means of x-ray or other radiation.
• radioactivity — the phenomenon, exhibited by and being a property of certain elements, of spontaneously emitting radiation resulting from changes in the nuclei of atoms of the element.
• radiograph — Also called shadowgraph. a photographic image produced by the action of x-rays or nuclear radiation.
• refractometry — an instrument for determining the refractive index of a substance.