Abstract
The amplification of electron avalanches in a uniform electric field between parallel electrodes can be used in single or multistep structures for a great variety of applications in fields such as charged-particle tracking, X-ray imaging, ultraviolet photon detection for ring imaging of Cherenkov light, beta autoradiography, and gamma-ray astrophysics. In this article some observed properties of parallel-electrode structures are analysed and compared with those of wire chambers. Parallel electrodes have advantages over wire chambers in their better energy resolution, better timing resolution, and the fact that they are easier to construct and are more durable. It is now possible to construct proportional gaseous detectors without the need to string wires, with readout options using either electronic charge signals or optical light imaging. For either of these methods the position and energy of the avalanches can easily be determined.
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