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English: An original illustration by Hans Geiger of the tube by which he observed the scattering of alpha particles by metal foils.

  • A - conical tube
  • B - bulb containing "radium emanation" (radon-222)
  • D - narrow aperture
  • E - metal foil
  • K - stopcock through which the radium emanation was introduced to the bulb
  • S - zinc sulfide screen
Source Hans Geiger (1910). The Scattering of the α-Particles by Matter. Proceedings of the Royal Society, vol. A83, p. 492-504.
Author Hans Geiger


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