It's usually americium-241. It undergoes alpha-decay with a half-life of about 400 years. Am-241 is artificially manufactured; it doesn't occur in nature.
The first smoke detectors are based on optical principles - photoelectric detectors.
Americium's normal phase is solid at room temperature. It is a silvery-white metal that is radioactive and is commonly used in smoke detectors.
Americium-241 is used in smoke detectors because it emits alpha particles that ionize the air inside the detector. This ionization process allows a small electric current to flow between two electrodes in the detector. When smoke enters the detector, it disrupts this current, triggering the alarm.
It might not seem obvious, but the "original use" of the element Americium was as a tool of scientific investigation. Americium is a synthetic element, so it was made in a nuclear reactor facility by exposing plutonium to the neutron flux in the operating core. It was produced in small quantities to investigate its nuclear, chemical and physical properties. That's what it was originally used for. You can read about it here: http://en.wikipedia.org/wiki/Americium
In the smoke detector, the fast - moving alpha particles enable the air to conduct an electric current. As long as the electric current is flowing, the smoke detector is silent. The alarm is triggered when the flow of electric current is interrupted by smoke entering the detector.
Americium 241
The element used in smoke detectors and named after the US is Americium (Am). It is a radioactive element commonly found in household smoke detectors to detect smoke particles in the air.
The synthetic element used in smoke detectors is Americium-241. It emits alpha particles that ionize the air within the smoke detector, causing a small electric current flow. When smoke particles disrupt this current, an alarm is triggered.
Americium-241 this is an emitter of alpha radiation, which is used in smoke detectors as it is very ionising and will not be able to travel through smoke. Therefore, in a fire the detector will not receive any alpha radiation and hence the alarm will go off.
A radioactive element is an element that emits radiation due to instability. They are commercially used in the generation of electricity in nuclear power plants and home smoke detectors among other things.
Americium is the radioactive element used in ionization type smoke detectors. It is a by-product of the nuclear power industry. In the device, it is present as the oxide, which is rather chemically inert and has a high melting point. As a small capsule enclosed in metal foil. Your exposure to radiation from an ionization smoke detector is smaller than your exposure received by sleeping alongside your partner who is converting K40 into Ar40.
Americium is a chemical element, not a base.
Smoke detectors typically contain americium-241. This radioactive isotope is used to ionize the air in the detector, allowing it to detect smoke particles and trigger the alarm.
Americium (pronounced /ˌæməˈrɪsiəm/) is a synthetic element that has the symbol Am, the atomic number 95, and is used in smoke detectors.
no. The most commonly used radioactive material is Americium
Americium is a synthetic element that has the symbol Am and atomic number 95. A radioactive metallic element, americium is an actinide that was obtained in 1944 by Glenn T. Seaborg who was bombarding plutonium with neutrons and was the fourth transuranic element to be discovered. It was named for the Americas, by analogy with europium. Americium is widely used in commercial ionization-chamber smoke detectors as well as in neutron sources and industrial gauges.
Americium has been used in smoke detectors since the 1950s. Its radioactive properties make it ideal for ionizing smoke particles in the detector, allowing it to quickly detect smoke and trigger the alarm.