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AMERICAN INSTITUTE OF PHYSICS / SCIENCE PHOTO LIBRARY AMERICAN INSTITUTE OF PHYSICS / SCIENCE PHOTO LIBRARY
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Hans Geiger. Portrait of the German physicist Hans Wilhelm Geiger (1882-1945). Geiger was educated in Germany and moved to Manchester, England, to work with Rutherford. In 1908 they devised a counter for alpha particles, a type of ionising radiation produced by radioactive materials. This led to the Geiger-Muller tube (1928) for the detection and measurement of levels of radiation. With Marsden, Geiger carried out the crucial experiment in 1909 that would lead to Rutherford's nuclear model of the atom.
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