Ads
related to: ionized smoke detector uses radioactive
Search results
Results From The WOW.Com Content Network
Smoke detector mounted on a ceiling. A smoke detector is a device that senses smoke, typically as an indicator of fire.Smoke detectors/Alarms are usually housed in plastic enclosures, typically shaped like a disk about 125 millimetres (5 in) in diameter and 25 millimetres (1 in) thick, but shape and size vary.
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 ...
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.
Americium is used in the most common type of household smoke detector, which uses 241 Am in the form of americium dioxide as its source of ionizing radiation. [101] This isotope is preferred over 226 Ra because it emits 5 times more alpha particles and relatively little harmful gamma radiation.
All of the remaining radioactive isotopes have ... Americium-241 is used in ionization smoke detectors ... It is the isotope used in an americium smoke detector based ...
Smoke detector: An ionization smoke detector includes a tiny mass of radioactive americium-241, which is a source of alpha radiation. Two ionisation chambers are placed next to each other. Both contain a small source of 241 Am that gives rise to a small constant current. One is closed and serves for comparison, the other is open to ambient air ...