Four input coincidence detector
AssigneeThe United States of America as represented by the Department of Health and Human Services
InventorWalter S. Friauf
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Abstract
A gamma ray scintillation coincidence detection circuit having four inputs connected to two gating configurations, fed by gamma ray detector units. Detection in any one of the four inputs develops a disabling signal in one signal path leading to an AND gate. Detection in any two of the four inputs results in a system output in another signal path. When any input goes high, the AND gate is disabled after a predetermined settable time delay T. If a second input goes high before the expiration of the delay time T, then the signal in the other path can pass through the AND gate and sets a latch, signifying that detector coincidence has occurred.
Claims14
A four-input scintillation coincidence detection device comprising four respective input terminals, single-input detection means for detecting the presence of a signal at any one of said four input terminals and for providing a first output signal, an AND gate, a delay circuit, circuit means connecting said first output signal to one input terminal of said AND gate via said delay circuit, whereby to provide a predetermined time delay of said first output signal, multiple-input detection means for detecting the presence of two respective signals at any two of said four input terminals and for providing a second output signal responsive to such last-named two-signal presence, circuit means connecting said second output signal to the remaining input terminal of said AND gate, and means to enable the AND gate to generate a coincidence output signal when said two respective signals are developed within a period shorter in length than said predetermined time delay.
The coincidence detection device of clam 1, and latch means connected to the output of said AND gate.
Dependencies are inferred from the claim text.