An artificial radioactive element with atomic number 95 (symbol Am), produced in nuclear explosions and reactors; emits alpha particles. See; Alpha Decay, Fission Products, Radioactivity.
a radioactive transuranic metallic element; discovered by bombarding uranium with helium atoms
a silvery metal; it is a man-made element whose isotopes americium-237 through -246 are all radioactive. Americium-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. Americium Smoke Alarms [ Click "BackButton" for previous location