File:PSM V87 D120 Apparatus for counting alpha particles.png
PSM_V87_D120_Apparatus_for_counting_alpha_particles.png (630 × 227 pixels, file size: 64 KB, MIME type: image/png)
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DescriptionPSM V87 D120 Apparatus for counting alpha particles.png |
English: Rutherford & Geiger alpha particle counter (1908) Used in early fundamental research on alpha particles. Alpha particles from a source in the firing tube were admitted through aperture "D" to the detecting vessel, which was a brass tube with a central co-axial wire "B" at a relative potential of 1320 volts dc. The aperture had a mica window so the detecting vessel could run at a pressure of 2-5 mm of mercury. These conditions enabled creation of a Townsend avalanche for every alpha particle entering the vessel. At very low count rates these registered as "kicks" on an electrometer needle.
The Geiger-Muller tube devised in 1928 used this principle of detection of ionizing radiation using an electron avalanche in a gaseous medium. |
Date | |
Source | Popular Science Monthly Volume 87 (The primary source of the figure appears to be the following article: E. Rutherford and H. Geiger (1908). "An electrical method of counting the number of α-particles from radio-active substances". Proc. R. Soc. Lond. A 81: 141-161. DOI:10.1098/rspa.1908.0065.) |
Author | E Rutherford FRS, H Geiger Ph.D; originally published in the proceedings of the Royal Society of the United Kingdom - read june 18th 1908. |
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Public domainPublic domainfalsefalse |
This media file is in the public domain in the United States. This applies to U.S. works where the copyright has expired, often because its first publication occurred prior to January 1, 1929, and if not then due to lack of notice or renewal. See this page for further explanation.
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current | 14:04, 11 May 2014 | 630 × 227 (64 KB) | Kurzon (talk | contribs) | cleaner version | |
05:24, 17 September 2012 | 1,632 × 494 (54 KB) | Ineuw (talk | contribs) | User created page with UploadWizard |
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File change date and time | 07:03, 11 May 2014 |