File:Detector regions.gif

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Summary

Description

English: Plot of relative level of ion-pair current with increasing voltage applied between anode and cathode for a wire cylinder ionisation detection system with constant incident ionising radiation. This covers the practical areas of operation of the Geiger-Muller counter, the proportional counter and the ionisation chamber. Alpha particles are more ionising than beta particles, so more current is produced in the ion chamber region by alpha than beta, but the particles cannot be differentiated. More current is produced in the proportional counting region by alpha particles than beta, but by the nature of proportional counting it is possible to differentiate alpha and beta pulses. In the Geiger region, there is no differentiation of alpha and beta as any single ionisation event in the gas results in the same current output. Note that gamma and X-ray photons result in the same plot shape; current also being dependent on radiation energy

Date 6 June 2012

Source Own work

Author Doug Sim

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File history

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	Date/Time	Dimensions	User	Comment
current	18:46, 3 February 2023	960 × 720 (60 KB)	Dougsim	Greater clarity and improved text to cover gas multiplication
	11:52, 15 November 2015	1,500 × 1,125 (109 KB)	Dougsim	improved diagram and text added.
	22:52, 13 November 2015	1,500 × 1,125 (105 KB)	Dougsim	Text and diagram added to show conceotual set-up and explain differences in operating pressure for practical applications.
	09:24, 10 January 2015	960 × 720 (32 KB)	Dougsim	Added in additional plot to show difference in ionisation effect of alpha and beta particles.
	21:45, 6 June 2012	960 × 720 (21 KB)	Dougsim	title in image changed to include constant radiation.
	16:06, 6 June 2012	960 × 720 (21 KB)	Dougsim