Abstract
WITH reference to the recent correspondence in NATURE on the properties of silica, the following experiments on its phosphorescence after exposure to ultra-violet and X-rays may be of interest. In the course of experiments to test the supposed fluorescence or phosphorescence of castor oil after exposure to ultra-violet light, it was found, working independently, that a photographic plate was blackened when exposed to the oil if the vapour were allowed to come in contact with it. If, however, the vessels containing the oil were carefully sealed no blackening was obtained, even when the oil had been previously exposed to ultra-violet light. The vessels containing the oil were sealed glass jars having polished natural quartz lenses as windows, the exposure to ultra-violet radiation being carried out in these vessels.
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HOPWOOD, F., MAYNEORD, W. X-ray Stimulation of Phosphorescence of Fused Silica. Nature 116, 98 (1925). https://doi.org/10.1038/116098a0
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DOI: https://doi.org/10.1038/116098a0
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