Radiation detector including means for indicating...

Details Radiation detector including means for indicating... Radiation detector including means for indicating...

2008-05-06

2008-05-06

Porta, David (Department: 2884)

Radiant energy

Calibration or standardization methods

C250S374000, C250S386000, C250S387000, C378S207000

Reexamination Certificate

active

10512256

ABSTRACT:
A radiation detector, comprising a sensitive volume filled with a counter gas; an anode and a cathode each in communication with the counter gas; a voltage supply for maintaining a potential difference between the anode and the cathode, said potential difference being less than required to cause gas discharge in the counter gas. The radiation detector further comprises a photoemissive material in communication with the sensitive volume. The photoemissive material may be provided as a coating on the cathode. The radiation detector may further comprise a controllable light source for supplying photons of a known wavelength to the photoemissive material. Electrons may be emitted by the photoemissive material in response to the provision of said photons, said electrons causing avalanche breakdown of the counter gas, indicating satisfactory operation of the radiation detector.

REFERENCES:
patent: 2982857 (1961-05-01), Clarke
patent: 3317823 (1967-05-01), Brodsky
patent: 3771005 (1973-11-01), Erickson
patent: 3775762 (1973-11-01), Trumble
patent: 4405234 (1983-09-01), Juaire
patent: 5180917 (1993-01-01), Wraight
patent: 6259099 (2001-07-01), Foulon et al.
patent: 6388250 (2002-05-01), Croydon et al.
patent: 6700496 (2004-03-01), Francke et al.
patent: 57 116276 (1982-07-01), None
patent: 57116276 (1982-07-01), None

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