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.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

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]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014

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]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.

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.
The American Heritage® Student Science Dictionary, Second Edition. Copyright © 2014 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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.
Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University, Farlex Inc.
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
Collins Spanish Dictionary - Complete and Unabridged 8th Edition 2005 © William Collins Sons & Co. Ltd. 1971, 1988 © HarperCollins Publishers 1992, 1993, 1996, 1997, 2000, 2003, 2005
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).
decays, it produces other elements, such as uranium and americium. These
About 1 percent is other heavy elements such as curium, americium and plutonium-239.
Euzal's body also contained the chemical elements americium and polonium.
By bombarding a thin film of americium with calcium ions, the research team was able to measure photons in connection with the new element's alpha decay.
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.
Americium ([Am.sup.241]) with the energy of 4.77*108 Bq was employed as a source of gamma radiation by the gamma-gamma logging In the selective modification ([gamma][gamma]-s).

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