I measures radiation
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Theodor Geiger was born in 1891.
Geiger counter was created in 1908.
September 24, 1945 in Potsdam, Germany
Peter Johann Nepomuk Geiger died in 1880.
A Geiger counter is a particle detector that measures Ionizing radiation, and emissions from nuclear radiation. Many of the Geiger counters are hand held and can be read from a screen on the front.