Ionizing radiation converter with catadioptric electron focusing

Details Ionizing radiation converter with catadioptric electron focusing Ionizing radiation converter with catadioptric electron focusing

1993-01-26

1994-10-18

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

313525, H01J 3150

Patent

active

053571002

ABSTRACT:
An ionizing radiation converter 10 comprises a vacuum tight enclosure 12; a cathode 16; an anode 18 defining a pinhole 20 and comprising an output phosphor layer facing away from the cathode; and focusing electrodes 26 and 30. The focusing electrodes, anode and cathode, in use, force photoelectrons, emitted by the cathode as a result of input ionizing radiation, to move through the pinhole, and back to the anode, so that the photoelectrons impinge on the output phosphor layer to provide an intensified signal representative of the input radiation.

REFERENCES:
patent: 3777201 (1973-12-01), Einstein
patent: 3974376 (1976-08-01), van der Sande
patent: 4208577 (1980-06-01), Wang
patent: 4555731 (1985-11-01), Zinchuk
patent: 4585935 (1986-04-01), Butterwick
Paper from the Proceedings of the Society of Photo-optical Instrumentation Engineers entitled "Application of Optical Instrumentation In Medicine" dated Nov. 29, 30, 1992.
R. Evrard; Catadioptric Electron Optics Using a Retarding Electrostatic Field and Its Application to the Development of Short Image Tubes of Very High Performance; 1979; pp. 133-141; Advances in Electronics and Electron Physics; vol. 52.
A. G. DuToit and C. F. VanHuyssteen; The Luminous Efficiency of a Phosphor Layer in the Forward and Backward Directions; 1985; Advances in Electronics and Electron Physics; vol. 64B.

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