Abstract: The invention relates to a collimator employed in X-ray equipment, which collimator comprises three or more perforated collimator plates. The purpose of the collimator is to prevent stray radiation, i.e. radiation scattered from the object under examination, from falling on the film. In a collimator according to the invention the collimator plates are arranged to form two groups. At least one collimator plate is located between the X-ray radiation source and the object under examination, and two or more collimator plates are located between the object and the X-ray film cassette. The holes of the collimator plates are superposed when seen from the focal point of the radiation source. The plate located nearest to the X-ray film casette is longer than the rest. It prevents stray radiation from falling on the film in the X-ray film cassette, when the collimator is moved between its extreme positions during the photography operation.

Abstract: An X-ray intensifying screen is disclosed which is made of material that transforms X-rays into light and a suitable binding agent, the screen comprising a screen member having a surface with a plurality of spaced recesses for channelling the light toward specific areas of the film and to prevent uncontrolled diffusion and scattering of the light generated by the X-rays.