Radiation detector including means for indicating satisfactory operation
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United States of America Patent
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May 6, 2008
Grant Date -
Sep 15, 2005
app pub date -
Apr 23, 2003
filing date -
Apr 23, 2002
priority date (Note) -
Expired
status (Latency Note)
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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.
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