To record information without affecting a video exposed on film by selectively controlling plural proximate X-ray sources.

The film 10 is coated with conversion material reacting to X-ray radiation and converting the X-ray radiation into a visible light beam so as to leave the video thereon, and desirably it is housed in a protective envelope through which the visible light beam is not transmitted. The film 10 is set under an X-ray tube 20 having plural X-ray sources 22 two- dimensionally arrayed in vacuum. For example, by arranging the extremely small ray sources 22 in a matrix state, the matrix of the X-ray source is constituted. The X-ray tube 20 where many small-sized ray sources are adjacently arrayed can print an image on the surface of photosensitive material by an element or a pixel. The respective X-ray sources can radiate the X-ray so that the corresponding pixel may be displayed. The X-ray source 22 is provided with a discharge cathod 24 having an anode 28 and one or more microchips 26.