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Geiger counter

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Gei·ger counter (ggr)
n.
An instrument that measures the intensity of radiation by detecting radioactive particles as they cross a metal or glass tube filled with gas, causing ionization of the gas molecules and producing an electrical discharge. Also called Geiger-Müller counter.

Geiger counter, Geiger-Müller counter
an amplifying device that indicates the presence of ionizing particles emitted by a substance; used as a means of determining the presence of radioactivity.

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With entertaining references to the movies and amusing anecdotes, Parker explains in easily understood terms the physics behind skydiving, holograms, autogiros, electromagnetic pulses, Geiger counters, hydrogen bombs, and other nifty devices.
``You can't see it, the only way you can tell is with a Geiger counter.
Lee accompanies him, and her Geiger counter meter shoots to the active side.
 
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