Relative efficiencies of energy to photographic density conversions in typical screen-film systems.

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Abstract
The speeds of 6 typical screen-film systems and the energy absorbed by their screen pairs were compared as a function of incident X-ray energy. Of the screen-film systems studied, 3 had calcium tungstate phosphors, 1 contained barium strontium sulfate and 2 were composed of a mixture of lanthanum oxysulfide with larger amounts of gadolinium oxysulfide. A source of monoenergetic radiation was used for measurement of the relationship between these 2 quantities as a function of keV. With certain exceptions, the speeds of screen-film systems act in a manner similar to predicted if only the energy absorption properties of their screens were considered.