Penneman, Robert A. Los Alamos National Laboratory, Los Alamos, New Mexico.
- Additional Readings
A chemical element, symbol Am, atomic number 95. The isotope 241Am is an alpha emitter with a half-life of 433 years. Other isotopes of americium range in mass from 232 to 247, but only the isotopes of mass 241 and 243 are important. The isotope 241Am is routinely separated from “old” plutonium and sold for a variety of industrial uses, such as 59-keV gamma sources and as a component in neutron sources. The longer-lived 243Am (half-life 7400 years) is a precursor in 244Cm production.
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