| 摘要 |
A metal side tube ( 2 ), a glass faceplate ( 3 ), and a stem plate ( 4 ) constitute a hermetically sealed vessel ( 5 ) for a photomultiplier tube. An edge portion ( 20 ) is provided at on open end (A) of the side tube ( 2 ). The edge portion ( 2 ) is embedded in the faceplate ( 3 ) in such a manner as to strike on the faceplate ( 3 ). Accordingly, high hermeticity at a joint between the side tube ( 2 ) and the faceplate ( 3 ) is ensured. The edge portion ( 20 ) extends upright in an axial direction of the side tube ( 2 ), so that the edge portion ( 20 ) can be embedded as close to a side face ( 3 c) of the faceplate ( 3 ) as possible. This structure increases an effective sensitive area of the faceplate ( 3 ) to nearly 100%, and decreases dead area as close to 0 as possible. As described above, the photomultiplier tube ( 1 ) according to the present invention has enlarged effective sensitive area of the side tube ( 3 ) and enhanced hermeticity of the joint between the faceplate ( 3 ) and the side tube ( 2 ).
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