Photomultiplier with secondary electron shielding means

Details Photomultiplier with secondary electron shielding means Photomultiplier with secondary electron shielding means

1988-02-12

1989-04-25

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

313533, H01J 4014

Patent

active

048250660

ABSTRACT:
A photomultiplier for converting an incident weak light into multiplied electrons to thereby output an electrical signal corresponding to the intensity of the incidence light. The photomultiplier comprises a photocathode for emitting primary electrons; plural dynodes for emitting secondary electrons in response to incident of the primary electrons and multiplying first secondary electrons passing between the dynodes; and shield means for preventing second secondary electrons emitted from a first dynode of the dynodes toward the photocathode from returning to the dynodes, thereby to reduce the generation of a residual pulse currents caused by the second secondary electrons and to accurately detect a main pulse current caused by the first secondary electrons.

REFERENCES:
patent: 2895068 (1959-07-01), Rodda
patent: 3109957 (1963-11-01), McGee et al.
patent: 3391295 (1968-07-01), Clayton

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