| 摘要 |
PURPOSE:To prevent insulating deterioration without allowing air and the like to remain in a connecting part between a MI cable and a detecting part by housing a radiation resistant MI cable for applying high voltage and taking out a signal in the inner part of a detector case. CONSTITUTION:A connecting part 4B between an MI cable and a detecting part is arranged under a cylindrical adaptor 21 attached to an end plate 14 of a case 20 and a MI cable terminal part 9 is placed in the case 20 of a detector body. The terminal part 9 and the adaptor 21 are jointed by the welding part 22 and the adaptor 21 is joined to the end plate 14 with a brazing part 23. Because of this construction, the terminal part 9 is heated and dehumidified simultaneously with the evacuation of the chamber to be performed before the detector is sealed with a sealing gas 19, thereby the detector and the terminal part 9 are placed under the same atmosphere with the sealing gas 19. As a result, the insulating deterioration can be prevented without being affected by the moisture content.
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