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Smoke alarms
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How do smoke alarms detect smoke?
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For more on marking an answer as the "Best Answer", please visit our FAQ.There is a small radioactive component within the detector. When smoke passes throught the radioactive field, the flow of the radiation is interrupted (sort of like a rock in a stream). The detector detects the change in the radiation, not the smoke itself. I believe there is actually a warning on the detector about radiation.