americium


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am·er·i·ci·um

 (ăm′ə-rĭsh′ē-əm)
n. Symbol Am
A white metallic transuranic element of the actinide series, having isotopes with mass numbers from 232 to 247. Am-241 and Am-243 are the isotopes with the longest half-lifes (432.2 years and 7,370 years, respectively), and are alpha-ray and gamma-ray emitters used as radiation sources in research, radiography, and smoke alarms. Atomic number 95; melting point 1176°C; boiling point 2011°C; specific gravity 12; valence 3, 4, 5, 6. See Periodic Table.

[After America.]

americium

(ˌæməˈrɪsɪəm)
n
(Elements & Compounds) a white metallic transuranic element artificially produced from plutonium. It is used as an alpha-particle source. Symbol: Am; atomic no: 95; half-life of most stable isotope, 243Am: 7.4 × 103 years; valency: 2,3,4,5, or 6; relative density: 13.67; melting pt: 1176°C; boiling pt: 2607°C (est)
[C20: from America (because it was discovered at Berkeley, California) + -ium]

am•er•i•ci•um

(ˌæm əˈrɪʃ i əm)

n.
a transuranic element, one of the products of high-energy helium bombardment of uranium and plutonium. Symbol: Am; at. no.: 95.
[1946; Americ(a) + -ium2]

am·er·i·ci·um

(ăm′ə-rĭsh′ē-əm)
Symbol Am A synthetic, silvery-white, radioactive metallic element of the actinide series that is produced artificially by bombarding plutonium with neutrons. Americium is used as a source of alpha particles for smoke detectors and gamma rays for industrial gauges. Its most stable isotope has a half-life of 7,950 years. Atomic number 95. See Periodic Table.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.americium - a radioactive transuranic metallic elementamericium - a radioactive transuranic metallic element; discovered by bombarding uranium with helium atoms
metal, metallic element - any of several chemical elements that are usually shiny solids that conduct heat or electricity and can be formed into sheets etc.
Translations
americium
أمريكيوم
америций
americi
americium
americium
americio
ameriitsium
amerikium
américium
americij
amerícium
ameríkín
アメリシウム
americium
americis
americium
ameryk
americiu
americium
americij
americium
อะเมริเซียม
amerikyum

americium

[ˌæməˈrɪsɪəm] Namericio m
References in periodicals archive ?
Americium doesn't have the same name recognition as a plutonium and uranium, but researchers have been trying to remove it from nuclear waste for decades.
The long-range availability of Americium looks attractive since increasing quantities of 241Am and 243Am could be expected from Plutonium recycle either in light-water power reactors or fast breeder reactors.
Other radioactive components, such as plutonium, americium, and curium, with half-lives of "thousands of years," were not addressed at all (House of Commons, 2013).
In one experiment measuring uptake of americium, worms exposed to contaminated sediments took up significantly more of the radioisotope than clams did.
Ozal was most likely poisoned with four separate substances," the paper reported the sources as saying, also naming the toxic metal cadmium and the radioactive elements americium and polonium as substances found in Ozal's remains.
However, some aspects are predictable, such as cesium-134, cesium-137, strontium-90, various forms of plutonium, americium, and iodine-131.
Transfer of polonium, neptunium, plutonium and americium to the primate fetus.
As far as isotopics go, we don't care about the in-growth of americium 241, because in a high-energy Prism reactor it will fission--it becomes fuel.
The radioactive source in smoke alarms, Americium, is a known carcinogenic.
They outline the important thermophysical properties of neptunium dioxide, the vapor pressure, and heat capacity; the results of a study on the vaporization behavior and phase relations in the plutonium oxide system; the vapor pressure of pure americium oxide samples; the variation of the total pressure of plutonium and americium bearing species over the solid solutions; and mass spectrometric investigations of candidate fuels and targets for transmutation of minor actinides.
DTPA can be used for patients who have been exposed to americium, plutonium, or curium.

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