X-Ray Noise Observation Using a Photoconductive Pickup Tube

A television pickup tube arrangement using a Vidicon for the direct recording of x-ray images is described. The transmitted x-ray picture shows noise characteristics that are clearly those of the absorbed x-ray photons. The internal conversion gain (number of carriers generated per absorbed x-ray ph...

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Bibliographic Details
Published in:Journal of applied physics 1954-02, Vol.25 (2), p.240-242
Main Authors: Cope, A. D., Rose, A.
Format: Article
Language:English
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Summary:A television pickup tube arrangement using a Vidicon for the direct recording of x-ray images is described. The transmitted x-ray picture shows noise characteristics that are clearly those of the absorbed x-ray photons. The internal conversion gain (number of carriers generated per absorbed x-ray photon) is estimated by two independent methods, one of which is based on a measurement of x-ray noise. Both methods give a gain of about 500 for a 100 kv x-ray photon. The agreement between the two methods is evidence for the validity of the simple electron-multiplier model for the noise current in the photoconductive selenium target. The appearance of x-ray noise means that all the information contained in the absorbed fraction of the x-ray beam is being transmitted. Thirty pictures per second are transmitted when irradiating the Vidicon with a 5 ma, 100 kv x-ray beam at a distance of two feet. Wires of one mil diameter were clearly observable.
ISSN:0021-8979
1089-7550
DOI:10.1063/1.1721612