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G01T 1/185 (2006.01) G01T 1/167 (2006.01) G01T 1/29 (2006.01) H01J 47/02 (2006.01)
Patent
CA 1216971
- 30 - APPARATUS FOR DETECTING AND DETERMINING THE DISTRIBUTION OF RADIOACTIVITY ON A MEDIUM ABSTRACT A detecting head assembly provides output signals relating to individual ionizing events due to radio- active decay of material in a medium such as a radio- chromatogram 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 detec- ting 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 coordinates 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 distribu- tion of radioactivity.
441856
G. Ronald Bell & Associates
Pullan Brian R.
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