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americium |
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americiumRadioactive metallic element of the actinide series, atomic number 95, relative atomic mass 243.13; it was first synthesized in 1944. It occurs in nature in minute quantities in pitchblende and other uranium ores, where it is produced from the decay of neutron-bombarded plutonium, and is the element with the highest atomic number that occurs in nature. It is synthesized in quantity only in nuclear reactors by the bombardment of plutonium with neutrons. Its longest-lived isotope is Am-243, with a half-life of 7,650 years. The element was named by US nuclear chemist Glenn Seaborg, one of the team who first synthesized it, by analogy with europium, the corresponding lanthanide. Ten isotopes are known. |
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? Mentioned in | ? References in periodicals archive | |
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They last only 10 years and contain radioactive Americium 241, so
send dead ones back to the manufacturer. To create them,
scientists slammed atoms of calcium and americium together at about
32,000 kilometers per second (20,000 miles per second) using a particle
accelerator machine. " It found that the levels of plutonium and
radioactive americium "detected at Lowry Landfill are 10 to 10,000
times greater than the average or maximum background levels reported for
Rocky Flats," the notorious nuclear weapons plant near Boulder. |
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americium
