Method and apparatus for determining random coincidence count ra

Details Method and apparatus for determining random coincidence count ra Method and apparatus for determining random coincidence count ra

1978-01-30

1980-01-01

Smith, Alfred E.

Radiant energy

Invisible radiant energy responsive electric signalling

With or including a luminophor

250366, 250369, 328110, 307232, G10T 120

Patent

active

041818555

ABSTRACT:
A method and related apparatus for the reliable determination of a random coincidence count attributable to chance coincidences of single-photon events which are each detected in only a single detector of a scintillation counter utilizing two detectors in a coincidence counting technique. A first delay device is employed to delay output pulses from one detector, and then the delayed signal is compared with the undelayed signal from the other detector in a coincidence circuit, to obtain an approximate random coincidence count. The output of the coincidence circuit is then applied to an anti-coincidence circuit, where it is corrected by elimination of pulses coincident with, and attributable to, conventionally detected real coincidences, and by elimination of pulses coincident with, and attributable to, real coincidences that have been delayed by a second delay device having the same time parameter as the first.

REFERENCES:
patent: 3772512 (1973-11-01), Laney
patent: 4031392 (1977-06-01), Giraud et al.
patent: 4071761 (1978-01-01), Horrocks
R. G. Suchannek et al., Method for Measuring Coincidences in the Presence of a High Level of Accidential Coincidences, Rev. Sci. Instrum., vol. 46, No. 8, 1975, pp. 1037-1039.

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