Geiger Counter

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Geiger Counter

</dt>
An instrument for detecting and measuring radioactivity. In full, Geiger-Muller counter. </dd>
This counter, essentially a thin-walled gas-filled metallic tube with a needle electrode projected within, detects the radiating particle indirectly. The particle penetrates the thin wall and ionizes the gas; a current is momentarily set up, which is detectable and measurable. Compare scintillation counter. </dd>

References

This article is based on NASA's Dictionary of Technical Terms for Aerospace Use