How does a Geiger counter detect radiation, and why does it make that clicking noise?
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Take a gas cylinder and apply high voltage across the radius of the tube. The voltage is not quite enough to produce a discharge, but it’s close.
If a particle gets into the gas and knocks a few electrons off some gas molecules, that makes a path that can conduct electricity. You get a brief discharge through the gas, which then stops immediately. That’s a pulse.
More particles, more pulses.
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