Annihilation radiation experiment, 1934

Annihilation radiation experiment, 1934

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Credit: EMILIO SEGRE VISUAL ARCHIVES/AMERICAN INSTITUTE OF PHYSICS/SCIENCE PHOTO LIBRARY

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Caption: Annihilation radiation experiment, 1934. German physicist Otto Ernst Heinrich Klemperer (1899-1987) is holding the dual Geiger-Muller counters that were used in the first experiment to show that two-quanta annihilation radiation appeared (coincidence measurement). This experiment was carried out at the Cavendish Laboratory, Cambridge, England, during the period when Rutherford was director of the laboratory. Klemperer studied under Geiger for his PhD in Berlin in 1923, but both he and Geiger came to England and together, they developed the Geiger-Klemperer radiation counter. Photographed on 18 August 1934.Restrictions:

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