Dynode structures for photomultipliers

Details Dynode structures for photomultipliers Dynode structures for photomultipliers

1987-05-28

1988-10-11

DeMeo, Palmer C.

Electric lamp and discharge devices

Photosensitive

Photomultiplier

313535, 313536, H01J 4318

Patent

active

047774037

ABSTRACT:
The first of a plurality of dynodes in a photomultiplier tube is made of a weldable nickel-beryllium alloy having a beryllium oxide layer thereon, formed into a desired shape from spot-welded segments. The dynode itself is then spot-welded to a support element. In one aspect of the invention, this first dynode has a scoop form. It is followed by a second dynode of spherical shape, made of a copper-beryllium alloy. A flap made of nickel-beryllium is juxtaposed to intercept photoelectrons that otherwise may escape photomultiplication in either the first or second dynodes. Additional venetian-blind type dynodes are employed to obtain the required photomultiplication.

REFERENCES:
patent: 3649868 (1972-03-01), Bensussan
patent: 3753023 (1973-08-01), Sommer
patent: 4112326 (1978-09-01), Faulkner
patent: 4431943 (1984-02-01), Faulkner et al.
patent: 4446401 (1984-05-01), Faulkner et al.
patent: 4593229 (1986-06-01), McDonie et al.

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