noun
A device used to detect and measure ionizing radiation, consisting of a Geiger-Muller tube connected to electronic equipment that amplifies and records the radiation pulses.
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The scientist used a Geiger counter to measure the levels of radiation in the area.
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I heard that they found some radioactive material using a Geiger counter.
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I'm going to bring my Geiger counter to check out that sketchy abandoned building.
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Her intuition was like a Geiger counter, always detecting the underlying tension in the room.