Experiments recently performed by the National Bureau of Standards provide data on the photographic response of commercial X-ray films at unusually high rates of exposure. Films of this kind are now used extensively for measuring X- and gamma ray exposures. To interpret film densities
in terms of exposure, however, a knowledge of film characteristics as determined under controlled laboratory conditions is required. By adding to this knowledge, the present study should help increase the reliability of such interpretations. The work was supported by the U.S. Atomic Energy
Commission and the U.S. Army Signal Corps, and the experiments were conducted by Margarete Ehrlich and W. L. McLaughlin of the Bureau's radiation physics laboratory.
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