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2. Smoke detector - Wikipedia

   en.wikipedia.org/wiki/Smoke_detector

   An ionization smoke detector uses a radioisotope, typically americium-241, to ionize air; a difference due to smoke is detected and an alarm is generated. Ionization detectors are more sensitive to the flaming stage of fires than optical detectors, while optical detectors are more sensitive to fires in the early smouldering stage.

3. Optical beam smoke detector - Wikipedia

   en.wikipedia.org/wiki/Optical_beam_smoke_detector

   An optical beam smoke detector is a device that uses a projected beam of light to detect smoke across large areas, [1] typically as an indicator of fire. [2] They are used to detect fires in buildings where standard point smoke detectors would either be uneconomical [3] or restricted for use by the height of the building.

4. Americium-241 - Wikipedia

   en.wikipedia.org/wiki/Americium-241

   The alarm's circuitry detects this drop in the current and as a result, triggers the piezoelectric buzzer to sound. Compared to the alternative optical smoke detector, the ionization smoke detector is cheaper and can detect particles which are too small to produce significant light scattering. However, it is more prone to false alarms.

5. Aspirating smoke detector - Wikipedia

   en.wikipedia.org/wiki/Aspirating_smoke_detector

   An aspirating smoke detector (ASD) is a system used in active fire protection, consisting of a central detection unit which draws air through a network of pipes to detect smoke. [1] The sampling chamber is based on a nephelometer that detects the presence of smoke particles suspended in air by detecting the light scattered by them in the chamber.

6. The Best Place to Put Your Smoke Detector (Plus 3 Spots ... - AOL

   www.aol.com/lifestyle/best-place-put-smoke...

   Replace smoke detectors at least every 10 years: Don't place your life in the hands of an outdated smoke alarm. For the most part, you can plan on replacing your smoke detector at least every 10 ...

7. Now hear this: Do you need a voice-activated smoke alarm? - AOL

   www.aol.com/news/2008-03-13-now-hear-this-do-you...

   The Kidssmart vocal smoke detector, which plays a recorded message when smoke is detected, is $99.95 at amazon.com. Judging by a quick search, the alarm doesn't seem to be widely available at ...