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caesium

   Also found in: Medical, Encyclopedia, Wikipedia, Hutchinson 0.03 sec.
cae·si·um  (sz-m)
n.
Variant of cesium.

caesium US, cesium [ˈsiːzɪəm]
n
(Chemistry / Elements & Compounds) a ductile silvery-white element of the alkali metal group that is the most electropositive metal. It occurs in pollucite and lepidolite and is used in photocells. The radioisotope caesium-137, with a half-life of 30.2 years, is used in radiotherapy. Symbol: Cs; atomic no.: 55; atomic wt.: 132.90543; valency: 1; relative density: 1.873; melting pt.: 28.39±0.01°C; boiling pt.: 671°C
ThesaurusLegend:  Synonyms Related Words Antonyms
Noun1.caesium - a soft silver-white ductile metallic element (liquid at normal temperatures)caesium - a soft silver-white ductile metallic element (liquid at normal temperatures); the most electropositive and alkaline metal
metal, metallic element - any of several chemical elements that are usually shiny solids that conduct heat or electricity and can be formed into sheets etc.
cesium 137 - a radioactive isotope of cesium used in radiation therapy
pollucite - a rare mineral that is an important source of cesium
Translations
caesium cesium (US) [ˈsiːzɪəm] Ncesio m
caesium, (US) cesium
nCäsium nt, → Zäsium nt


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Optical clocks like the strontium clock in the PTB could be the atomic clocks of the future; some of them though are already ten times more precise and stable than the best primary caesium atomic clocks.
The results showed that they contained caesium 137, a highly toxic radioactive substance normally produced by a nuclear explosion or from the combustion of a nuclear reactor.
Restrictions remain in place on more than 300 Welsh farms and affecting around 180,000 sheep, as the caesium stays in the soil and vegetation of upland areas.
 
 
 
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