Radiant energy – Invisible radiant energy responsive electric signalling – Including a radiant energy responsive gas discharge device
Patent
1983-11-23
1987-01-27
Fields, Carolyn E.
Radiant energy
Invisible radiant energy responsive electric signalling
Including a radiant energy responsive gas discharge device
250374, G01T 1185
Patent
active
046396012
ABSTRACT:
A detecting head assembly provides output signals relating to individual ionizing events due to radioactive decay of material in a medium such as a radiochromatogram or electrophoretogram. The detecting head assembly comprises a scanning head which includes an ionization chamber comprising two spaced detecting electrodes each including an array of spaced conductors. The conductors extend transversely of one another to provide a plurality of conductor crossing points. A mask having a plurality of radiation transmissive zones or apertures is supported relative to the detecting electrodes such that said zones or apertures respectively correspond with the conductor crossing points. The scanning head is slidably supported in juxtaposition with a sample receiving zone and is driven by a stepper motor or motors to cause the scanning head, and hence the mask, to scan a predetermined path, whereby the radiation transmissive zones or apertures in the mask expose corresponding conductor crossing points to respective scanning regions on a sample. Signal processing means, connected to the conductors, include means for coding the output signals with regard to position co-ordinates of the individual ionizing events detected in said scanning regions of said ionization chamber means, and a processor for processing the coded signals in order to provide an output related to the distribution of radioactivity.
REFERENCES:
patent: 3234386 (1966-02-01), Leventhal et al.
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Botter-Jensen et al., "A Multicounter System for Scanning Ultra-Low-Level Radiochromatograms", Nucl. Instrum. & Methods, 144 (3), 1977, pp. 529-532.
Pullan, "Measuring Radionuclide Distribution with Crossed-Wire Spark Chambers", Nucleonics, Jul. 1966.
Ebert Michael
Fields Carolyn E.
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