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A Spectrographic Study of Ultra-Violet Fluorescence Excited by X-rays

A Spectrographic Study of Ultra-Violet Fluorescence Excited by X-rays Fluorescent spectra excited by x-rays. —(1) Ultra-violet . In order to photograph the spectrum, the specimen being studied was placed in front of the slit of a Fuess single-prism quartz spectrograph and was exposed to x-rays from a Coolidge tube with the target about 12 cm off. With the tube operating at.002 amp. and 50 kv and a slit width of.15 mm, exposures up to 15 hours were made. Over one hundred substances were tested. Fourteen double salts of uranium, 23 oxides, 50 other compounds and also anthracene, chrysoidine, eosin and fluorescine gave no ultra-violet fluorescence, though some show brilliant bands in the visible; but positive results were obtained with the chlorides of Cd , Cs , Li , K , Na , and Rb , and also with KBr , KI , Ba SO 4 , Ra SO 4 and Ca WO 4 . NaCl gave a strong band with maximum at 2470A and CsCl gave a band extending from 5720 to 2340A with three maxima. Several willemite screens, some x-ray intensifying screens and one fluoroscopic screen also showed ultraviolet fluorescence. The intensity of fluorescent response decreased for successive exposures. (2) Visible fluorescence . One or more bands in the visible were emitted by all the salts showing ultra-violet fluorescence, except barium and radium sulfates, and also by ZnO, CdI, Cu 2 I 2 and HgCl and, of course, by the uranyl salts. Changes of color of chlorides due to x-rays. —RbCl was observed to turn dark blue, NaCl buff, KCl and LiCl pink, and CsCl blue. The original white color was restored by exposure to sunlight, but did not return in the dark. This change may be due to a reduction to the metal and Cl, which is then occluded. The salts had been carefully purified. Photo-electric photometer for measuring distribution of density in a spectrogram is described. A Kunz cell was used. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Physical Review American Physical Society (APS)

A Spectrographic Study of Ultra-Violet Fluorescence Excited by X-rays

Perrine, J. O
Physical Review , Volume 22 (1) – Jul 1, 1923
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Publisher
American Physical Society (APS)
Copyright
Copyright © 1923 The American Physical Society
ISSN
1536-6065
DOI
10.1103/PhysRev.22.48
Publisher site
See Article on Publisher Site

Abstract

Fluorescent spectra excited by x-rays. —(1) Ultra-violet . In order to photograph the spectrum, the specimen being studied was placed in front of the slit of a Fuess single-prism quartz spectrograph and was exposed to x-rays from a Coolidge tube with the target about 12 cm off. With the tube operating at.002 amp. and 50 kv and a slit width of.15 mm, exposures up to 15 hours were made. Over one hundred substances were tested. Fourteen double salts of uranium, 23 oxides, 50 other compounds and also anthracene, chrysoidine, eosin and fluorescine gave no ultra-violet fluorescence, though some show brilliant bands in the visible; but positive results were obtained with the chlorides of Cd , Cs , Li , K , Na , and Rb , and also with KBr , KI , Ba SO 4 , Ra SO 4 and Ca WO 4 . NaCl gave a strong band with maximum at 2470A and CsCl gave a band extending from 5720 to 2340A with three maxima. Several willemite screens, some x-ray intensifying screens and one fluoroscopic screen also showed ultraviolet fluorescence. The intensity of fluorescent response decreased for successive exposures. (2) Visible fluorescence . One or more bands in the visible were emitted by all the salts showing ultra-violet fluorescence, except barium and radium sulfates, and also by ZnO, CdI, Cu 2 I 2 and HgCl and, of course, by the uranyl salts. Changes of color of chlorides due to x-rays. —RbCl was observed to turn dark blue, NaCl buff, KCl and LiCl pink, and CsCl blue. The original white color was restored by exposure to sunlight, but did not return in the dark. This change may be due to a reduction to the metal and Cl, which is then occluded. The salts had been carefully purified. Photo-electric photometer for measuring distribution of density in a spectrogram is described. A Kunz cell was used.

Journal

Physical Review – American Physical Society (APS)

Published: Jul 1, 1923

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