Electron multiplier with improved dynode geometry for reduced cr

Details Electron multiplier with improved dynode geometry for reduced cr Electron multiplier with improved dynode geometry for reduced cr

1993-11-08

1996-01-02

Yusko, Donald J.

Electric lamp and discharge devices

Photosensitive

Photomultiplier

313535, 313536, H01J 4310

Patent

active

054811589

ABSTRACT:
The present invention relates to a linear multi-anode photomultiplier or electron multiplier on which a plurality of light beams to be measured or energy beams of electrons, ions and so forth are incident one-dimensionally. The object of the present invention is to prevent crosstalk between dynode arrays caused by leaking electrons. A transmission type photomultiplier is characterized in that the direction of secondary electron emission of the first-stage dynode of each dynode array is set in the opposite direction at 180.degree. from that of an adjacent dynode array. Then, adjacent dynode arrays will not oppose each other but are shifted from each other at a predetermined distance in the lateral direction. Accordingly, even if electrons leak from a gap between dynodes of a certain dynode array, the leaking electrons will not enter the adjacent dynode array, thereby preventing crosstalk.

REFERENCES:
patent: 2433700 (1947-12-01), Larson
patent: 4649314 (1987-03-01), Eschard
patent: 4825118 (1989-04-01), Kyushima
patent: 4881008 (1989-11-01), Kyushima et al.
patent: 4998037 (1991-03-01), Kerkhof et al.
patent: 5077504 (1991-12-01), Helvy
patent: 5126629 (1992-06-01), Chopy
patent: 5196690 (1993-03-01), Flesner et al.
RCA Photomultiplier Handbook, 1980, pp. 17, 18 and 26-35.
Patent Abstracts of Japan, vol. 9, No. 19 (E-292)(1742) 25 Jan. 1985 & JP-A-59 167 946 (Hamamatsu) 21 Sep. 1984 *abstract*.

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