Radiant energy – Invisible radiant energy responsive electric signalling – With or including a luminophor
Patent
1994-09-26
1997-01-07
Fields, Carolyn E.
Radiant energy
Invisible radiant energy responsive electric signalling
With or including a luminophor
250366, 250367, G01T 1169
Patent
active
055919766
ABSTRACT:
A system for detecting and imaging gamma radiation emitted by a contaminated area includes a plurality of collimators spaced a distance apart from each other. The collimators have a plurality of holes therethrough and the holes of one collimator are aligned with the holes in another collimator for forming a plurality of hole alignments which permit gamma rays to pass through the collimators. A scintillator and operatively connected avalanche photodiode are provided with each aligned hole of the collimators for determining the position of the gamma ray which passes through the collimators. A video camera records a visual image of the contaminated area and a monitor displays the video image along with location and size information provided by the avalanche photodiodes.
REFERENCES:
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patent: 3936639 (1976-02-01), Barrett
patent: 4465540 (1984-08-01), Albert
patent: 4672207 (1987-07-01), Derenzo
"A Nuclear Survey Instrument with Capability", Redus, Nagarkar, Cirignano, McGann & Squillante, IEEE Transactions on Nuclear Science, vol. 39, No. 4, 1992.
"Images obtained with a compact gamma camera", Bird & Ramsden Nuclear Instructions and Methods in Physics Research A299 (1990) 480-483.
Berthold John W.
Kidwell J. Jeffrey
Norton Douglas A.
Reed Stuart E.
Edwards Robert J.
Fields Carolyn E.
Marich Eric
The Babcock & Wilcox Company
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