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10313942
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Early Geiger counter, made by Hans Geiger, 1932.

Hans Geiger (1882-1945) worked closely with Ernest Rutherford (1871-1935) to develop radiation measuring devices. In this early example a low pressure gas is held in a copper cylinder fitted with a handle. An electrical current is then applied between the copper casing and a thin wire running along its centre. The particle entering the cylinder causes a burst of electric current which is registered on a counter. This particular Geiger counter was used by James Chadwick, the discoverer of the neutron.

Image No. 10313942 | This is a Rights Managed image.

Inventory No.: 1982-1707
Credit © Science Museum / Science & Society Picture Library -- All rights reserved.
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