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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
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Author Doug Sim
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Date/TimeThumbnailDimensionsUserComment
current18:46, 3 February 2023Thumbnail for version as of 18:46, 3 February 2023960 × 720 (60 KB)DougsimGreater clarity and improved text to cover gas multiplication
11:52, 15 November 2015Thumbnail for version as of 11:52, 15 November 20151,500 × 1,125 (109 KB)Dougsimimproved diagram and text added.
22:52, 13 November 2015Thumbnail for version as of 22:52, 13 November 20151,500 × 1,125 (105 KB)DougsimText and diagram added to show conceotual set-up and explain differences in operating pressure for practical applications.
09:24, 10 January 2015Thumbnail for version as of 09:24, 10 January 2015960 × 720 (32 KB)DougsimAdded in additional plot to show difference in ionisation effect of alpha and beta particles.
21:45, 6 June 2012Thumbnail for version as of 21:45, 6 June 2012960 × 720 (21 KB)Dougsimtitle in image changed to include constant radiation.
16:06, 6 June 2012Thumbnail for version as of 16:06, 6 June 2012960 × 720 (21 KB)Dougsim

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