Radiant energy – Invisible radiant energy responsive electric signalling – With or including a luminophor
Patent
1989-05-22
1992-09-08
Hannaher, Constantine
Radiant energy
Invisible radiant energy responsive electric signalling
With or including a luminophor
250364, 250366, 250367, 250369, G01T 1178
Patent
active
051460939
ABSTRACT:
A low-level liquid scintillation measurement system for counting sample optical events resulting from the radioactive decay of a constituent of a sample to be measured while reducing the counting of background optical events which are optical events produced by background radiation and which create electrical pulses other than pulses representing a sample optical event. This system includes a detector located adjacent the sample for detecting optical events and for converting optical events into electrical pulses, a coincidence sensor for receiving the electrical pulses from the detector and producing a trigger pulse when the electrical pulses from the detector coincide with each other, a burst detector for receiving the trigger pulses from the coincidence sensor and the electrical pulses from the detector for determining the number of electrical pulses present in a selected interval following each of the trigger pulses, evaluator connected to the burst detector for determining, in response to the number of pulses detected in the selected interval, the extent to which the optical event represented by the corresponding trigger pulse should be treated as a sample optical event or a background event, and an active guard shield arrangement comprising an auxiliary scintillator optically coupled to the detector. The shield is adapted to be excited by background radiation and to effectively increase the number of electrical pulses present in the selected interval following a trigger pulse generated as a result of the coincident pulses produced due to the background radiation. The axuiliary scintillator is a glass comprising oxides of lithium, magnesium, silicon and cerium.
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Noakes John E.
Valenta Robert J.
Hannaher Constantine
Packard Instrument Company Inc.
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