Abstract

Photomultipliers sensitized to the extreme ultraviolet by coating with a layer of a fluorescent material were found satisfactory for the measurement of radiation intensities at least down to 850 angstroms. The relative spectral quantum efficiencies of sodium salicylate, pump oil, anthracene, calcium and cadmium tungstates, and Eastman ultraviolet fluorescing lacquer were measured by comparison against a thermocouple, using a vacuum monochromator. Sodium salicylate was found to be the best suited for sensitizing a photomultiplier, since it had high sensitivity to the extreme ultraviolet and low sensitivity to long wavelength stray light. Heterochromatic photometry can be carried out with this combination, since the quantum efficiency of sodium salicylate was approximately independent of wavelength over the range 900–2300A. The properties of stilbene, phenanthane, and several miscellaneous phosphors were also measured.

© 1951 Optical Society of America

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