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Person

Hans Geiger

A black-and-white portrait of Hans Geiger, wearing glasses and a formal suit, with a thoughtful expression.

German physicist (1882–1945) who worked under Rutherford at Manchester from 1907 and helped run the alpha-scattering experiments that revealed the nucleus. He is better remembered for the radiation counter he developed in 1908 and refined with Walther Müller in 1928, which made ionising radiation audible as clicks and gave the world a folk-instrument for detecting the invisible.

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