单词 | isotope |
释义 | isotopei‧so‧tope /ˈaɪsətəʊp $ -toʊp/ noun [countable] technical ![]() ![]() WORD ORIGINisotope ExamplesOrigin: 1900-2000 iso- + Greek topos ‘place’EXAMPLES FROM THE CORPUS word sets
WORD SETS► Elements Collocationsaluminium, 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 one of the possible different forms of an atom of a particular element (=simple chemical substance)· 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. |
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