Ion Detector large gas filled capacitor. Proportional Detector cylindrical shape higher voltage townsend avalanche freeing of electrons in a positive feedback cycle. A. inert gas. _. +. inert gas. +. _. Ion Detectors and The Proportional Detector. diagram for both circuits.
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incorporate drift time of freed ions to achieve greater position resolution
Multiwire Proportional Detector
uses many anode wires closely spaced; sandwiched between a pair of cathode plates
greater resolution, larger scale
(the inventor)Multiwire Proportional Detectors and The Drift Detector