Abstract
The authors have developed a new gas filled avalanche or spark producing image intensifier detector for X and γ rays. This instrument has been used for visualization of radioisotopes fixed in human organs. Essentially, the detector is composed of three plane parallel electrodes; incident photons are detected between cathode and grid, electronic avalanches take place between grid and anode. Depending on the applied grid-anode voltage, sparks are directly recorded on camera, or small luminous avalanches are focussed on an image intensifier. When electric field permits sparking, an electronic circuit triggered by initiation of the spark has been studied to discharge the grid anode capacitance. Approximately, every photon absorbed by gas between cathode and grid produces a spark. High yield is obtained with xenon.
Published Version
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