Photomultiplier tube having a heat shield with alkali vapor sour

Details Photomultiplier tube having a heat shield with alkali vapor sour Photomultiplier tube having a heat shield with alkali vapor sour

1981-02-24

1984-01-17

Moore, David K.

Electric lamp and discharge devices

Photosensitive

Photomultiplier

313105R, H01J 4000

Patent

active

044265964

ABSTRACT:
An improved photomultiplier tube of the type having a longitudinally-extending tube axis includes an evacuated envelope having a generally cylindrical wall member. The wall member is closed at one end by a face-plate and at the other end by a stem, heat sealed to the wall member. At least one source of alkali vapor is within the envelope. A photoemissive cathode is formed on the faceplate. A dynode cage assembly is spaced from the cathode in proximity to the stem. A plurality of stem leads extend through the stem for energizing the cathode, the dynode cage assembly and the source of alkali vapor. A heat shield is disposed transversely across the tube axis between the dynode cage assembly and the stem. The heat shield isolates the dynode cage assembly from the deleterious effect of the heat generated during the sealing of the stem to the wall member. The heat shield comprises a substantially inert, insulative material. The source of alkali vapor is mounted on the heat shield facing the dynode cage assembly. The heat shield also shields the vapor source from the heat generated during the sealing of the stem to the wall member.

REFERENCES:
patent: 1943984 (1934-01-01), Nakken
patent: 2200722 (1940-05-01), Pierce et al.
patent: 2404803 (1946-07-01), Stafford
patent: 2414099 (1947-01-01), Glass et al.
patent: 2880344 (1959-03-01), Stoudenheimer
patent: 2952499 (1960-09-01), Carson
patent: 3753023 (1973-08-01), Sommer
patent: 3858955 (1975-01-01), Sommer
patent: 3884539 (1975-05-01), Sommer
Butterwick, "Oil Exploration with Photomultiplier Tubes," RCA Technical Communications/Copyright 1979/printed in USA'; pp. 62-65.

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