Radiant energy – Invisible radiant energy responsive electric signalling – With or including a luminophor
Patent
1994-05-20
1996-04-30
Hannaher, Constantine
Radiant energy
Invisible radiant energy responsive electric signalling
With or including a luminophor
250207, 2502521, G01T 1208
Patent
active
055127550
ABSTRACT:
An electronic gain control for the photomultipliers of a gamma camera assures that all photomultipliers in the camera have uniform gain for any given gamma event. A specific dynode in the photomultiplier is isolated from the line resistive voltage divider string in the photomultiplier which places each dynode under incremental voltages. A voltage is then applied to the isolated dynode which can vary anywhere from the voltage the isolated dynode would have had if inserted in the voltage divider string to the voltage that the immediately preceding or immediately succeeding dynode in the string has whereby the photomultiplier's gain is controlled. The voltage applied to the isolated dynode is established for each photomultiplier in the camera by individual gain signals developed and stored during calibration of the camera for each radio active isotope whereby all photomultipliers have uniform gain for each isotope.
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Photomultiplier Handbook, By Burle Industries, Inc., Copyright 1980, pp. 3-9, 80-90, and 100-104.
Cochrane Geoffrey G.
Gibbons John C.
Vickers David S.
Hannaher Constantine
Nawalanic Frank J.
Summit World Trade Corp.
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