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单词 americium
释义
americium
noun[U]
uk
/ˌæm.əˈrɪs.i.əm/us
/ˌæm.əˈrɪs.i.əm/
(symbolAm)
achemicalelementthat is a silver-whitemetal. It isradioactiveand is used to makesmokedetectors(=devicesthat make aloudnoisewhensmokeispresent):
镅（一种放射性化学元素）
tinyquantitiesof americium极少量的镅
More examples
  • Two newdrugshave beenapprovedtotreatradiationcontaminationduetoplutonium, americium, or curium.
  • Officialsinsistthat thelowlevelsofplutonium, americium and otherman-maderadioactivecontaminantspresentin the groundwaterposenopublichealththreat.
SMART Vocabulary: related words and phrases
Chemical elements
  • actinium
  • alkali metal
  • antimony
  • astatine
  • berkelium
  • bismuth
  • brimstone
  • calcium
  • fluorine
  • germanium
  • lithium
  • manganese
  • nickel
  • plutonium
  • quicksilver
  • selenium
  • silicon
  • sodium
  • sulphur
  • transition metal
See more results »
(Definition ofamericiumfrom theCambridge Advanced Learner's Dictionary & Thesaurus© Cambridge University Press)

Examplesofamericium

americium
To determine the a-value, two discs were irradiated with an -241americiumsource.
From theCambridge English Corpus
In the case of plutonium, the material changes its characteristics over time, mainly as a result of the formation ofamericium241.
From the
Hansard archive
Example from the Hansard archive. Contains Parliamentary information licensed under theOpen Parliament Licence v3.0
Is it true, for example, that one wasamericium?
From the
Hansard archive
Example from the Hansard archive. Contains Parliamentary information licensed under theOpen Parliament Licence v3.0
Practically all the plutonium 241 andamericium241 remains indefinitely immobilised below the surface layer of seabed sediments.
From the
Hansard archive
Example from the Hansard archive. Contains Parliamentary information licensed under theOpen Parliament Licence v3.0
It is estimated that about one third of this had decayed to give some 5,560 curies ofamericium241 by the end of 1982, the rest remaining as plutonium 241.
From the
Hansard archive
Example from the Hansard archive. Contains Parliamentary information licensed under theOpen Parliament Licence v3.0
Theamericium-241 and curium-242 isotopes also were produced by irradiating plutonium in a nuclear reactor.
From
Wikipedia
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Am can be used for generating heavieramericiumisotopes by further neutron capture inside a nuclear reactor.
From
Wikipedia
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The alpha particles emitted by the decay of theamericiumcollide with the light beryllium nuclei, producing fast neutrons.
From
Wikipedia
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Americiumis a relatively soft radioactive metal with silvery appearance.
From
Wikipedia
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Americiumis commonly used in industry as both an alpha particle and low photon energy gamma radiation source.
From
Wikipedia
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Uranium and thorium also have diverse current or historical uses, andamericiumis used in the ionization chambers of most modern smoke detectors.
From
Wikipedia
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They checked for different radioactive substances including gamma emitters, plutonium,americiumand strontium.
From
Wikipedia
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Its toxicity is comparable to, but slightly lower than that ofamericiumand plutonium.
From
Wikipedia
Creatives commons iconThis example is from Wikipedia and may be reused under a CC BY-SA license.
This was the fifth transuranium element discovered after neptunium, plutonium, curium andamericium.
From
Wikipedia
Creatives commons iconThis example is from Wikipedia and may be reused under a CC BY-SA license.
A small source of radioactiveamericiumis placed so that it maintains a current between two plates that effectively form an ionisation chamber.
From
Wikipedia
Creatives commons iconThis example is from Wikipedia and may be reused under a CC BY-SA license.
These examples are from corpora and from sources on the web. Any opinions in the examples do not represent the opinion of the Cambridge Dictionary editors or of Cambridge University Press or its licensors.
#https://dictionary.cambridge.org//dictionary/english/americium##
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更新时间：2024/12/28 0:25:44