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2. Smoke detector - Wikipedia

   en.wikipedia.org/wiki/Smoke_detector

   An americium container from a 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 ...

3. Gaseous ionization detector - Wikipedia

   en.wikipedia.org/wiki/Gaseous_ionization_detector

   Ionization-type smoke detectors are gaseous ionization detectors in widespread use. A small source of radioactive americium is placed so that it maintains a current between two plates that effectively form an ionisation chamber. If smoke gets between the plates where ionization is taking place, the ionized gas can be neutralized leading to a ...

4. Ionization chamber - Wikipedia

   en.wikipedia.org/wiki/Ionization_chamber

   The ionization chamber has found wide and beneficial use in smoke detectors. In an ionisation type smoke detector, ambient air is allowed to freely enter the ionization chamber. The chamber contains a small amount of americium-241, which is an emitter of alpha particles which produce a constant ion current. If smoke enters the detector, it ...

5. How to reset a smoke alarm that won’t stop beeping - AOL

   www.aol.com/reset-smoke-alarm-won-t-205535790.html

   The First Alert Ionization Smoke Alarm is a battery-operated alarm that’s easy to install. Its ionization sensor can detect smoke from flaming fires, including paper and grease fires. It also ...

6. 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.

7. Americium - Wikipedia

   en.wikipedia.org/wiki/Americium

   Any smoke that enters the chamber absorbs the alpha particles, which reduces the ionization and affects this current, triggering the alarm. 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 ...