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单词 radioactivity
释义
radioactivity
noun[U]
uk
/ˌreɪ.di.əʊ.ækˈtɪv.ə.ti/us
/ˌreɪ.di.oʊ.ækˈtɪv.ə.t̬i/
thequalitythat someatomshave ofproducingatypeofenergythat can be veryharmfultohealth
放射（性）
theenergyproducedbyatomsin this way:
放射线；辐射线；辐射能
Adangerousamountof radioactivity wasreleasedinto theenvironmentlastmonth.上个月泄漏了大量的放射线，造成很大危险。
SMART Vocabulary: related words and phrases
Physics: radiation & radioactivity
  • alpha particle
  • background radiation
  • decay
  • gamma radiation
  • gamma ray
  • half-life
  • irradiated
  • irradiation
  • luminosity
  • non-ionizing
  • non-irradiated
  • radiation
  • radioactive
  • radioisotope
  • sievert
  • spectrometer
  • tritium
  • UVA
  • UVB
  • weak force
See more results »
(Definition ofradioactivityfrom theCambridge Advanced Learner's Dictionary & Thesaurus© Cambridge University Press)

Examplesofradioactivity

radioactivity
After incubation for 4 h the precipitates were washed again, transferred to the new tubes and theirradioactivitydetermined.
From theCambridge English Corpus
Two aspects of this alteration and the value ofradioactivityto advanced life deserve attention, as detailed below.
From theCambridge English Corpus
A significant increase in the amount ofradioactivityincorporated into the frozen- thawed fraction from the mixed population was evident 6 h after incubation.
From theCambridge English Corpus
The results were calculated by expressing the boundradioactivityas a percentage of the totalradioactivity.
From theCambridge English Corpus
Radioactivitywas found in all three intermediates - 3-ketosphingosine, dihydrosphingosine and sphingosine.
From theCambridge English Corpus
In the high altitude environment, oxygen and air density decrease, temperature and humidity are low and there is an increase inradioactivity.
From theCambridge English Corpus
Phenomena such as collisions,radioactivityand thermodynamics make for novel compositional tools via these sonification methods.
From theCambridge English Corpus
At the time stated, samples were taken for cytotoxicity assay andradioactivitydetermination.
From theCambridge English Corpus
Incorporatedradioactivitywas measured at time-points between 10 and 120 sec.
From theCambridge English Corpus
Transport was calculated from counts of decompositions ofradioactivityrecorded from a scintillation counter ; and expressed as rmoles/108 cells.
From theCambridge English Corpus
Nuclear wastes emit heat, although the amount varies according to the nature of the wastes and theirradioactivity.
From theCambridge English Corpus
Such decreases in efflux ofradioactivityin response to tripelennamine were observed in each of five other experiments.
From theCambridge English Corpus
Three millilitres of scintillation fluid were added to the void volume andradioactivitymeasured.
From theCambridge English Corpus
Other areas of reducedradioactivitywere classified as small lesions.
From theCambridge English Corpus
The amount ofradioactivityfixed in the tubes was compared with that of control tubes reacted with the antibody alone.
From theCambridge English Corpus
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/radioactivity##
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更新时间：2024/12/28 15:23:28