DEFINITION OF GEIGER COUNTER

Geiger counters are instruments that

detect and measure ionizing radiation that is emitted from

radioactive sources. The instrument contains a gas-filled tube

that has an electric current passing through it. When any

radiation is passed through this tube a gas is discharged

inside the tube, and it causes the gas to be a conductor that is

measured by the Geiger counter, which emits an audible

clicking. The gas-filled glass tube acts like a simple electrode,

and radiation simply completes the circuit, enabling the

Geiger counter to detect alpha and beta rays that are given

off by radioactive material.

See also RADIOACTIVE DECAY.

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