Hans Geiger Co-Invented the Geiger Counter:
In 1928, German physicist Hans Geiger co-invented the Geiger Counter, a portable machine that counted (detected) alpha particles. His co-inventor was fellow German physicist Walther Müller. Hans Geiger began his research on equipment to count alpha particles in 1907 while working as an assistant to British chemist Ernest Rutherford at the University of Manchester. In 1911, Hans Geiger and Ernest Rutherford co-invented a predecessor to the Geiger counter that was used in their studies of radiation.
Hans Geiger Biography:
Born September 30 1882, Died September 24 1945: Hans Geiger was born at Neustadt-an-der-Haardt, Germany. His father, Wilhelm Ludwig Geiger was a philosophy professor at the University of Erlangen. Between 1902 and 1906, Geiger studied physics and mathematics at the University of Erlangen and received a Ph.D. In 1912, he became the head of the Physical-Technical Reichsanstalt (German National Institute for Science and Technology) in Berlin. During WWII, Hans Geiger was a member of Uranverein or the Uranium Club, a team of scientist that attempted to build an atomic bomb
Hans Geiger - Theories of Radioactivity :
In 1910, Hans Geiger and Ernest Rutherford demonstrated that two alpha-particles are emitted in the radioactive decay of uranium. In 1912, Hans Geiger and J. M. Nuttal proved that this is caused by two uranium isotopes, their finding was called the Geiger-Nuttall rule. The Geiger-Nuttall rule states that a linear relationship exists between the logarithm of the range of alpha-particles and the radioactive time constant, which is involved in the rate of decay of emitting nuclei.
Definition of a Geiger Counter:
A radiation detector consisting of two electrodes with a low-pressure gas in between. A voltage is maintains such that if radiation passing through the counter ionizes the gas, an avalanche of electrons will occur. Geiger counters can count radiation but cannot distinguish either the energy or kind of radiation.