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To compensate for such elements, an optical device has been improvised which consists of cylindrical lens, with narrow leaner focus in which the fluorescent light coming out of the intensifying screen is converged.
Most significantly, by using an intensifying screen, Putin was able to create the image with an exposure of only several seconds--a far shorter exposure than would have been required to expose the film using direct x-rays.
The phosphor layer is the active layer in the intensifying screen. When x-rays stimulate the phosphor layer, it converts the x-rays' energy to visible light.
The function of an intensifying screen is to reduce the exposure and increase image contrast where subject contrast is low.
Because the photographic film was not used with an intensifying screen, its slower speed make it less susceptible to the less-than-satisfactory ambient temperatures and humidity.