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5 May 1994 X-ray imaging camera tube using highly sensitive CdTe photoconductive film
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With the use of polycrystalline cadmium telluride (CdTe) film as the photoconductive target a 1' x-ray imaging camera tube (vidicon) was developed. This vidicon yields an x ray signal current of 200 nA cm-2 for 2.58 mc kg-1 min-1 radiation. This is a higher value when compared with that of conventional x ray vidicon (45 nA cm-2) which uses PbO as the photoconductive target. At the target voltage of 35 V a dark current of 5 nA cm-2 is generated in the developed vidicon at room temperature. When this vidicon is used with a diode mode electron gun and a mixed field type deflection electrode, a resolution of more than 15 micrometers can be obtained. Rf sputtering method produces large and uniform films, therefore, 1.5' films could be easily fabricated. The vidicon developed with 1.5' CdTe film yields better shading characteristics, a wide field of vision which is twice as large, and a higher signal current compared to those of 1' type vidicon.
© (1994) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Yasuhiro Tomita, Toshio Takabayashi, Toshiaki Kawai, and Yoshinori Hatanaka "X-ray imaging camera tube using highly sensitive CdTe photoconductive film", Proc. SPIE 2173, Image Acquisition and Scientific Imaging Systems, (5 May 1994);


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