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Accurate measurements and electron/photon transport calculations provide evidence that the film's optical density is a single-valued function of the absorbed dose in the emulsion of industrial x-ray films. As a result, the film sensitivity is proportional to the absorbed dose in the emulsion per roentgen. Spectral sensitivity is calculated for energies between 20 keV and 10 MeV and for various film-screen combinations. The intensifying action of metal screens on film sensitivity is calculated as a function of screen's thickness for various photon energies and film-screen combinations. The results of our calculations are supported by the experimental data.
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Barnea et al. (1987) studied this question.
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