单词	americium
释义	americium /ˌaməˈrɪsjəm / noun [mass noun] The chemical element of atomic number 95, a radioactive metal of the actinide series. Americium does not occur naturally and was first made by bombarding plutonium with neutrons. (Symbol: Am) Internal contamination with plutonium, americium, or curium can occur through a variety of routes including ingestion, inhalation, or direct contact through wounds.... It was the first commercial manufacturer of plutonium and americium neutron sources for oil well, logging and other applications. 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. Origin 1940s: from America (where it was first made) + -ium.
随便看	LOCOG locoman locomobile locomobility locomote locomotility locomotion locomotive locomotive boiler locomotive cab locomotive car locomotive cheer locomotive engineer locomotive engineering locomotive faculty locomotive fireman locomotively locomotiveness locomotive power locomotive rhythm locomotive runner locomotive shed locomotive-type locomotivity locomotor

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