The basic parameters characterizing the optical properties of the roentgen screens of all types included in the CMEA Standards and GOSTs have been considered. The classification of screens is given. The measurement principles for the absolute and relative characteristics of their effectiveness are described. The properties of the screens determining their effect on the image quality such as the definition of the picture, the graininess and the minimal size of observed details have been considered. The methods of controlling the persistence of the screens and the presence of radionuclide tracks have been described.
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