The intensifying action of calcium tungstate screens in combination with X-ray film has been investigated over a wide range of X-ray wavelengths equivalent to X-rays generated with energies of between 40-1200 kV. By means of the evaluation of the quantum- and energy-efficiencies of screen and film an understanding of their behaviour, i.e. their utilization of energy within this range of quantum energies, is obtained.
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R. Herz (1956) studied this question.
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