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Photoelectric & Ionization Smoke Detectors |
Ionization Detectors Ionization detectors have an ionization chamber and a source of ionizing
radiation. The source of ionizing radiation is a minute quantity of americium-241
(perhaps 1/5000th of a gram), which is a source of alpha particles (helium
nuclei). The ionization chamber consists of two plates separated by about
a centimeter. The battery applies a voltage to the plates, charging one
plate positive and the other plate negative. Alpha particles constantly
released by the americium knock electrons off of the atoms in the air,
ionizing the oxygen and nitrogen atoms in the chamber. |
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