Abstract
IT is well known that the sensitivity of an ordinary photographic emulsion begins to fall rapidly just below 2500 A., and is very low at 2100 A. This fall is due to the absorption of short-wave radiation by the gelatin of the emulsion. It is commonly stated1 that higher sensitivity in this region may be obtained by greatly reducing the gelatin content of the emulsion, as in the Schumann plate, or by bathing an ordinary plate in a fluorescent substance which can convert the short waves into radiation able to penetrate the gelatin.
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References
For example Hopfield and Appleyard, J. Opt. Soc. America, 22, 488 (1932). Weichmann, Z. wiss. Phot., 34, 140 (1935).
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HUNTER, A., PEARSE, R. Sensitivity of Photographic Plates in the Region 2500–2100 A. Nature 138, 37–38 (1936). https://doi.org/10.1038/138037b0
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DOI: https://doi.org/10.1038/138037b0
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