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When radioactive material collides with gas atoms, the atoms become ionized and release electrons that attach to the anode, creating electrical pulses that can be read by a meter.
A metal or glass tube filled with gas that is ionized by passing charged particles, producing within the tube an electric charge indicative of a particular particle.
[After Hans Wilhelm Geiger (1882-1945), German physicist.]
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|Noun||1.||Geiger tube - an ionization chamber contained in a tube in a Geiger counter|