Americium 2
Americium 2 : Chemistry and Chemical Disasters. (Chem; Nucl Phys; Symb: Am) A silvery-white radioactive, alphaemitting, metallic element, at. no. 95, mass 241, mp 1079?C, and half-life of 433 years. Used as a radioa?ctive source in certain ionization-type smoke detectors