Scintillation multiplexer

Details Scintillation multiplexer Scintillation multiplexer

1986-09-11

1988-09-13

Heyman, John S.

Electrical pulse counters, pulse dividers, or shift registers: c

Applications

Measuring or testing

377 10, 250328, G01T 1208

Patent

active

047714441

ABSTRACT:
A liquid scintillation counter system utilizes multiplexing to achieve monitoring of a plurality of scintillation samples using relatively few sensors, such as photomultiplier tubes, each such photomultiplier tube, in a specific embodiment, receiving light generated by scintillation events in a plurality of the scintillation samples. Each scintillation sample, which may be contained in a vial, is coupled by means of light guides to at least two of the photomultipler tube. Some background noise is eliminated by use of discriminators which establish a predetermined threshold level for the magnitude of the outputs of the photomultiplier tube, above which the pulses are countable. Coincident circuitry is used to determine the presence of a scintillation event, and thereby issue a coincidence pulse which is counted. In accordance with the invention, n photomultiplier tubes can be used to monitor (n/2)(n-1) samples.

REFERENCES:
patent: 3723736 (1973-03-01), Lawey
patent: 3906230 (1975-09-01), Hagen
patent: 3984690 (1976-10-01), Marshall, III et al.
patent: 4001589 (1977-01-01), Airma et al.
patent: 4131798 (1978-12-01), Reddy et al.
patent: 4187428 (1980-02-01), Pochwalski et al.
patent: 4206504 (1980-06-01), Frey
patent: 4303410 (1981-12-01), Copeland

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