Definition of americium in English:



  • The chemical element of atomic number 95, a radioactive metal of the actinide series.

    • ‘It was the first commercial manufacturer of plutonium and americium neutron sources for oil well, logging and other applications.’
    • ‘Internal contamination with plutonium, americium, or curium can occur through a variety of routes including ingestion, inhalation, or direct contact through wounds.’
    • ‘Kept secret until after the war, they were respectively called americium and curium.’
    • ‘When americium was used as a target in this research, evidence for the formation of a new element was obtained.’
    • ‘Trace levels of plutonium and americium from nuclear weapons tests in the 1960s can be found in most homes, as can radioactive isotopes of caesium from the Chernobyl accident in 1986.’


1940s: from America (where it was first made) + -ium.