The most commonly used portable radiation detection and
measuring instrument, consisting of a gas-filled tube containing electrodes, between
which an electrical voltage but no current flows. When ionizing radiation passes
through the tube, a short, intense pulse of current passes from the negative electrode
to the positive electrode and is measured or counted. The number of pulses per second
measures the intensity of the radiation field. Geiger counters are highly sensitive
to beta particles but relatively insensitive to gamma rays and x-rays.
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