Hans Geiger

Hans Geiger
Geiger in 1928
Born	Johannes Wilhelm Geiger (1882-09-30)30 September 1882 Neustadt an der Haardt, Kingdom of Bavaria, German Empire
Died	24 September 1945(1945-09-24) (aged 62) Potsdam, Ostzone, Allied-occupied Germany
Alma mater	University of Erlangen (PhD, 1906)
Known for	Performing the Rutherford scattering experiments (1906–1913) Geiger counter (1908) Geiger–Nuttall law (1911) Bothe–Geiger coincidence experiment (1924) Geiger–Müller tube (1928)
Father	Wilhelm Geiger
Relatives	Rudolf Geiger (brother)
Awards	Hughes Medal (1929) Duddell Medal and Prize (1937)
Scientific career
Fields	Nuclear physics
Institutions	Victoria University of Manchester (1906–1912) Physikalisch-Technische Reichsanstalt (1912–1925) University of Kiel (1925–1929) University of Tübingen (1929–1936) Technische Universität Berlin (1936–1945)

Johannes Wilhelm Geiger (/ˈɡaɪɡər/; German: [joˈhanəs ˈvɪlhɛlm ˈɡaɪɡɐ]; 30 September 1882 – 24 September 1945) was a German nuclear physicist. He is known as the inventor of the Geiger counter, a device used to detect ionizing radiation, and for carrying out the Rutherford scattering experiments, which led to the discovery of the atomic nucleus. He also performed the Bothe–Geiger coincidence experiment, which confirmed the conservation of energy in light-particle interactions.

He was the brother of meteorologist and climatologist Rudolf Geiger.