| 摘要 |
PROBLEM TO BE SOLVED: To provide an X-ray detector easy and safe to handle. SOLUTION: This detector has a light detecting tube 10 formed of a metallic positive electrode 10b and negative electrode 10c arranged adjacently to each other within a glass bulb 10a having discharge gas sealed therein, and sensitive to the ultraviolet ray and X-ray incident on the glass bulb 10a, and a thermally contracting tube 12 closely fitted to the outer surface of the light detecting tube 10, so that the ultraviolet ray incident on the light detecting tube 10 is shielded by the thermally contracting tube 12.
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