词汇 | caesium |
释义 | caesium noun[ U ] UK(UScesium)uk /ˈsiː.zi.əm/ us /ˈsiː.zi.əm/(symbolCs) a chemical element that is a soft, silver-white alkaline metal. Caesium reacts strongly with other chemicals and is used in photocells.铯(金属元素,银白色,质软,化学性质活泼,用于制光电池) Chemical elements actinium alkali metal americium antimony astatine berkelium brimstone calcium fluorine germanium lithium manganese nickel plutonium quicksilver selenium silicon sodium sulphur transition metal The atomic weight of caesium has been determined by the analysis of its chloride and bromide. The separation of caesium from the minerals which contain it is an exceedingly difficult and laborious process. Examples of caesiumcaesium It is found that the addition of as little as 1% of caesium profoundly alters the properties of the plasma. Equations (3a)-(3f) express the law of mass action applied to the two ionization stages of noble gases and caesium. Over the next 10 days, an area of about 1000# km, containing many villages and farms, was heavily contaminated with plutonium, caesium and radioactive iodine. Those formed in mixtures of noble gases and caesium, in particular, are also of importance in different laboratory situations; for example, plasma etching and ion-beam etching. The observed plasma formed from atomic hydrogen generated at a tungsten filament that heated a titanium dissociator and one of potassium, rubidium, caesium and their carbonates and nitrates. Again, this is primarily ascribable to the variations in ne due to the presence of caesium, although the inclusion of electron-atom collisions provides a non-negligible contribution as well. Three hundred and six samples of milk were analysed for both caesium 134 and caesium 137. From the Hansard archive Example from the Hansard archive. Contains Parliamentary information licensed under the Open Parliament Licence v3.0 They are a means of ensuring that caesium does not come on to the market from young unfinished lambs. From the Hansard archive Example from the Hansard archive. Contains Parliamentary information licensed under the Open Parliament Licence v3.0 Low concentrations of caesium radionuclides are detectable in people generally as a result of atmospheric fallout and releases from nuclear installations. From the Hansard archive Example from the Hansard archive. Contains Parliamentary information licensed under the Open Parliament Licence v3.0 Radionuclides such as the isotopes of iodine and caesium would not normally be present. From the Hansard archive Example from the Hansard archive. Contains Parliamentary information licensed under the Open Parliament Licence v3.0 The map referred to was a preliminary contour map of the caesium deposition. From the Hansard archive Example from the Hansard archive. Contains Parliamentary information licensed under the Open Parliament Licence v3.0 A representative selection of public water sources has been monitored for several years for radioactive strontium and caesium. From the Hansard archive Example from the Hansard archive. Contains Parliamentary information licensed under the Open Parliament Licence v3.0 Caesium is a mobile element which moves with the water and is therefore a good indicator of current flows. From the Hansard archive Example from the Hansard archive. Contains Parliamentary information licensed under the Open Parliament Licence v3.0 But—and this is important—the government scientists are conducting laboratory experiments on the uptake of caesium from different types of soil. From the Hansard archive Example from the Hansard archive. Contains Parliamentary information licensed under the Open Parliament Licence v3.0 The take-up of caesium occurs over a period. From the Hansard archive Example from the Hansard archive. Contains Parliamentary information licensed under the Open Parliament Licence v3.0 See all examples of caesium 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. |
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