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A quartz monochromator has been used to measure the relative response of several synthetic phosphors in the region of 2200A to 3150A. The deactivating effect of copper and nickel on certain substances is represented graphically. With a vacuum grating spectrograph the response characteristics of zinc silicate and calcium tungstate have been extended to the Schumann ultraviolet region.
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N. C. Beese (1939) studied this question.
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