A very thin layer of a substance covering a surface.
The voltage applied to the terminals of the filament in an x-ray system typically ranges from approximately five to 15 volts.
This is a delicate, see-through layer made of cellulose acetate or a similar substance, covered with a coating that’s sensitive to light or radiation, used for creating images like X-rays. The term can also refer to any slender layer or film, such as the tear film that covers the surface of the eyeball.