英语词汇“isotope”的英英意思、用法、释义、翻译、读音、例句、短语、词组-英语词典

WORD ORIGINisotope

Origin:

1900-2000 iso- + Greek topos ‘place’

EXAMPLES FROM THE CORPUS

Asteroids contain a variety of rare radioactive isotopes of potassium, uranium, thorium, rubidium, and so on.
But by looking at the levels of various isotopes, geochemists can group the rocks that have similar deep-earth origins.
Electricity produced by radioactive isotopes, strontium 90, polonium 210, by thermoelectric energy conversion.
The isotopes give off long-lasting alpha radiation and the waste will remain dangerous for 3000 years or more.
There is also a section on isotope dilution analysis.
Thiemens said that it might even be possible to apply the effect to enrichment of certain isotopes.
Uranium has two radioactive isotopes, each of which decays to an isotope of lead and helium.
Woodhead etal. combine such analyses with oxygen isotope analyses, and it is variations in the latter that are particularly significant.

WORD SETS► Elements

aluminium, nounargon, nounarsenic, nounbarium, nounbase metal, nounbismuth, nouncadmium, nouncaesium, nouncalcium, nouncarbon, nounchlorine, nounchromium, nouncobalt, nouncopper, nounferrous, adjectivegold, noungold, adjectivegolden, adjectivehalogen, nounhydro-, prefixhydrogen, nouniodine, nouniridium, nouniron, nounisotope, nounkrypton, nounlead, nounlithium, nounmagnesium, nounmanganese, nounmercury, nounmolybdenum, nounnickel, nounnitrogen, nounoxygen, nounphosphorus, nounplatinum, nounplutonium, nounpotassium, nounprecious metal, nounradium, nounradon, nounselenium, nounsilicon, nounsilver, nounsilver, adjectivesodium, nounstrontium, nountin, nountin, adjectivetitanium, nountrace element, nountungsten, nounuranium, nounxenon, nounzinc, noun

COLLOCATIONS FROM THE CORPUSADJECTIVE► radioactive

· The new ingredient in the assessment of how many deaths the Windscale cloud caused is the radioactive isotope, polonium 210.· Electricity produced by radioactive isotopes, strontium 90, polonium 210, by thermoelectric energy conversion.· The simplest radioactive methods are based on decay of a radioactive isotope into a stable one.· Every radioactive isotope provides an independent clock for measuring geological time.· She could hear the adjacent streetlight sizzling like a radioactive isotope.· Asteroids contain a variety of rare radioactive isotopes of potassium, uranium, thorium, rubidium, and so on.· Increasing the helium-3 supply would mean scaling up the production of the dangerous radioactive isotope tritium.

► stable

· Each case has to be considered on its merits where an ambiguous answer emerges from the stable isotope data.· As well as decaying naturally to a stable lead isotope, U occasionally also divides in half.· A stable isotope of potassium, 9K, is converted to 39Ar by neutron bombardment of the sample to be dated.

NOUN► analysis

· Aiding his efforts was an improved method for dating rock known as uranium-lead isotope analysis.

► data

· Each case has to be considered on its merits where an ambiguous answer emerges from the stable isotope data.

► lead

· As well as decaying naturally to a stable lead isotope, U occasionally also divides in half.· Nevertheless the association or dissociation of the lead isotope signatures for ancient glasses contributes to the overall technological picture for them.

► oxygen

· Woodhead etal. combine such analyses with oxygen isotope analyses, and it is variations in the latter that are particularly significant.· The oxygen isotope chemistry of the corals reflects the composition and origin of the water in which they lived.· The deep-sea core oxygen isotope record is a framework for a relative chronology for the Pleistocene.

► ratio

· Measurements of the resulting isotope ratios closely approximated those found in carbonaceous chondrite meteorites.

► signature

· Nevertheless the association or dissociation of the lead isotope signatures for ancient glasses contributes to the overall technological picture for them.

单词	isotope
释义	isotopei‧so‧tope /ˈaɪsətəʊp $ -toʊp/ noun [countable] technical Word Origin WORD ORIGINisotope Origin: 1900-2000 iso- + Greek topos ‘place’ Examples EXAMPLES FROM THE CORPUS Asteroids contain a variety of rare radioactive isotopes of potassium, uranium, thorium, rubidium, and so on. But by looking at the levels of various isotopes, geochemists can group the rocks that have similar deep-earth origins. Electricity produced by radioactive isotopes, strontium 90, polonium 210, by thermoelectric energy conversion. The isotopes give off long-lasting alpha radiation and the waste will remain dangerous for 3000 years or more. There is also a section on isotope dilution analysis. Thiemens said that it might even be possible to apply the effect to enrichment of certain isotopes. Uranium has two radioactive isotopes, each of which decays to an isotope of lead and helium. Woodhead etal. combine such analyses with oxygen isotope analyses, and it is variations in the latter that are particularly significant. word sets WORD SETS► Elements aluminium, nounargon, nounarsenic, nounbarium, nounbase metal, nounbismuth, nouncadmium, nouncaesium, nouncalcium, nouncarbon, nounchlorine, nounchromium, nouncobalt, nouncopper, nounferrous, adjectivegold, noungold, adjectivegolden, adjectivehalogen, nounhydro-, prefixhydrogen, nouniodine, nouniridium, nouniron, nounisotope, nounkrypton, nounlead, nounlithium, nounmagnesium, nounmanganese, nounmercury, nounmolybdenum, nounnickel, nounnitrogen, nounoxygen, nounphosphorus, nounplatinum, nounplutonium, nounpotassium, nounprecious metal, nounradium, nounradon, nounselenium, nounsilicon, nounsilver, nounsilver, adjectivesodium, nounstrontium, nountin, nountin, adjectivetitanium, nountrace element, nountungsten, nounuranium, nounxenon, nounzinc, noun Collocations COLLOCATIONS FROM THE CORPUSADJECTIVE► radioactive · The new ingredient in the assessment of how many deaths the Windscale cloud caused is the radioactive isotope, polonium 210.· Electricity produced by radioactive isotopes, strontium 90, polonium 210, by thermoelectric energy conversion.· The simplest radioactive methods are based on decay of a radioactive isotope into a stable one.· Every radioactive isotope provides an independent clock for measuring geological time.· She could hear the adjacent streetlight sizzling like a radioactive isotope.· Asteroids contain a variety of rare radioactive isotopes of potassium, uranium, thorium, rubidium, and so on.· Increasing the helium-3 supply would mean scaling up the production of the dangerous radioactive isotope tritium. ► stable · Each case has to be considered on its merits where an ambiguous answer emerges from the stable isotope data.· As well as decaying naturally to a stable lead isotope, U occasionally also divides in half.· A stable isotope of potassium, 9K, is converted to 39Ar by neutron bombardment of the sample to be dated. NOUN► analysis · Aiding his efforts was an improved method for dating rock known as uranium-lead isotope analysis. ► data · Each case has to be considered on its merits where an ambiguous answer emerges from the stable isotope data. ► lead · As well as decaying naturally to a stable lead isotope, U occasionally also divides in half.· Nevertheless the association or dissociation of the lead isotope signatures for ancient glasses contributes to the overall technological picture for them. ► oxygen · Woodhead etal. combine such analyses with oxygen isotope analyses, and it is variations in the latter that are particularly significant.· The oxygen isotope chemistry of the corals reflects the composition and origin of the water in which they lived.· The deep-sea core oxygen isotope record is a framework for a relative chronology for the Pleistocene. ► ratio · Measurements of the resulting isotope ratios closely approximated those found in carbonaceous chondrite meteorites. ► signature · Nevertheless the association or dissociation of the lead isotope signatures for ancient glasses contributes to the overall technological picture for them. one of the possible different forms of an atom of a particular element (=simple chemical substance)
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