A Geiger counter is a device that calculates ionizing radiation such as alpha particles, beta particles, or gamma rays. The device got its name from its inventor, Johannes Wilhelm Geiger, who was born in Neustadt, Germany on 30 September 1882. Geiger’s research was based on the work of 19th-century British physicist John Dalton, whose research included the behavior of gases that is known as Dalton’s Atomic Theory. Later, he earned a fellowship at the University of Manchester, where he collaborated with New Zealand-born physicist Ernest Rutherford, winner of the 1908 Nobel prize for chemistry.
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