Proportional Counter or PC detector

•  The proportional counter is a type of gaseous ionization detector device used to measure particles of ionizing radiation. 
• The key feature is its ability to measure the energy of incident radiation, by producing a detector output pulse that is proportional to the radiation energy absorbed by the detector due to an ionizing event; hence the detector's name. 
• It is widely used where energy levels of incident radiation must be known, such as in the discrimination between alpha and beta particles, or accurate measurement of X-ray radiation dose.

•  A proportional counter uses a combination of the mechanisms of an ionization chamber, and operates in an intermediate voltage region between these. 
• The accompanying plot shows the proportional counter operating voltage region for a co-axial cylinder arrangement.

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