n. [ Radio- + -graph. ] 1. An instrument for measuring and recording solar radiation. [ Webster 1913 Suppl. ]
2. An image or picture produced upon a sensitive surface, as of a photographic or fluorescent plate, by some form of penetrating radiation other than light, as X-rays, beta rays, etc.; esp., a picture of the internal structure of opaque objects traversed by the rays; a skiagraph. When the picture is produced upon photographic film by X-rays, the picture is usually called an X-ray photo or X-ray. When an image is produced on photographic film by a radioactive substance in close proximity to the film, in a manner so as to record the spatial distribution of the radioactive substance, the resulting image is called an autoradiograph or autoradiogram. [ Webster 1913 Suppl. +PJC ]
n. Art or process of making radiographs, radiograms, or autoradiograms. -- ra`di*o*graph"icra`di*o*graph"ic*al a. -- Ra`di*o*graph"ic*al*ly, adv. [Webster 1913 Suppl.]
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