| 摘要 |
PURPOSE:To provide a thin type radiation two-dimensional detector in which the incident radiation can be efficiently converted into an electric signal, and the aperture can be easily extended. CONSTITUTION:A target structure 3, a two-dimensional cathode 4, and an electron beam control electrode 5 are housed in a vacuum vessel 2, and a laser scanning device 6 is arranged on the outside of the vacuum vessel 2. The target structure 3 converts a transmitted X-ray of two-dimensional distribution into a visual beam image by a phosphor 12, and then converts it into a potential of two dimensional distribution by a photoconductive film 14. On the other hand, an electron beam (e) is taken out by scanning the photoelectric converting film 7 of the two-dimensional cathode 4 by a laser beam LB, and the photoconductive film 14 of the target structure 3 is two-dimensionally scanned by this electron beam (e), whereby the potential distribution on the photoconductive film 14 is read.
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