Most smoke detectors contain a small amount of the alpha emitter americium-241.
From the en.wikipedia.org
Americium is a synthetic element that has the symbol Am and atomic number 95.
From the en.wikipedia.org
Most household smoke detectors contain americium formed in nuclear reactors.
From the en.wikipedia.org
Its toxicity is comparable to, but slightly lower than that of americium and plutonium.
From the en.wikipedia.org
As a result, americium 241, curium 242, 243, and 244 were detected as shown in the attachment 3.
From the scienceblogs.com
The actual danger of the radioactivity from the americium is tiny.
From the forbes.com
We do, after all, insist that houses all have americium in them.
From the forbes.com
The circle of darker metal in the center is americium-241, the surrounding casing is aluminium.
From the en.wikipedia.org
Isotopes of strontium, plutonium and americium account for less than 5 percent of the estimated dose.
From the sciencedaily.com
More examples
A radioactive transuranic metallic element; discovered by bombarding uranium with helium atoms
The chemical element (symbol Am) with an atomic number of 95
A silvery metal; it is a man-made element whose isotopes Am-237 through Am-246 are all radioactive. Am-241 is formed spontaneously by the beta decay of plutonium-241. Trace quantities of americium are widely used in smoke detectors, and as neutron sources in neutron moisture gauges.
Symbol:"Am" Atomic Number:"95" Atomic Mass: (243)amu. Americium is one of the elements in the actinide series of inner transition elements. It may also be classified as a rare earth element. This element is radioactive and can be safely used in small amounts. ...
An artificial radioactive element with atomic number 95 (symbol Am), produced in nuclear explosions and reactors; emits alpha particles.
A fissionable, artificial element that can be used to produce nuclear explosives. The principal isotope, americium 241, is created as a result of the decay of plutonium 241. Other important isotopes are americium 242 and 243.