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Geiger counter

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noun Gei·ger counter \ˈgī-gər-\

Simple Definition of Geiger counter

  • : an instrument used for finding and measuring radioactivity

Source: Merriam-Webster's Learner's Dictionary

Full Definition of Geiger counter

  1. :  an instrument for detecting the presence and intensity of radiations (as cosmic rays or particles from a radioactive substance) by means of their ionizing effect on an enclosed gas which results in a pulse that is amplified and fed to a device giving a visible or audible indication

Origin of geiger counter

Hans Geiger †1945 German physicist


First Known Use: 1924


Medical Dictionary

Geiger counter

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noun Gei·ger count·er \ˈgī-gər-ˌkau̇n-tər\

Medical Definition of Geiger counter

  1. :  an instrument for detecting the presence and intensity of radiations (as cosmic rays or particles from a radioactive substance) by means of the ionizing effect on an enclosed gas which results in a pulse that is amplified and fed to a device giving a visible or audible indication



Biographical Note for geiger counter

Geiger, Hans (Johannes) Wilhelm (1882–1945), and Müller \ˈmue-lər\play , Walther (flourished 1928), German physicists. Geiger did significant research on atomic theory, radioactivity, and cosmic rays. He developed a number of techniques and instruments for the detection and counting of individual charged particles. With the British physicist Ernest Rutherford (1871–1937), he developed in 1908 the first radiation counter, an instrument that counted alpha particles. With the help of Müller he introduced an improved version of the Geiger counter in 1928. The Geiger-Müller counter marked the introduction of modern electrical devices into radiation research.


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