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MHT-CET : Chemistry Entrance Exam

MHT - CET : Chemistry - Nuclear and Radiochemistry Know More

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Geiger-Muller Counter
The Geiger - Muller counter was developed by German physicist Geiger (1882 - 1945). This counter tube detects ionising radiations. It conains of a metal cylinder surrounding an inner wire. One end of the cylinder is closed and at the other end there is a window of mica or thin aluminium. The wire is positively charged and the cylinder is negatively charged. The cylinder consists of small amounts of argon and an organic vapour such as ether. Ionising radiations enter the cylinder through the mica window. They collide with the argon gas and positive ions are produced. These ions again collide with more argon atoms to further produce ions. Thus, a large amount of ions are produced. Along with the positive ions electrons are also produced that are attracted towards the positively charged wire. The positive ions and electrons produced in this way create a short impulse of electricity that is amplified and read by a meter. The meter thus records the level of radiation that enters the cylinder. The organic vapour that is present along with argon gas removes the unwanted ions that are produced in the cylinder.

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