caesium


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Related to caesium: caesium 137

cae·si·um

 (sē′zē-əm)
n. Chiefly British
Variant of cesium.

caesium

(ˈsiːzɪəm) or

cesium

n
(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

ce•si•um

(ˈsi zi əm)

n.
a rare highly reactive soft metallic element of the alkali metal group used chiefly in photoelectric cells. Symbol: Cs; at. wt.: 132.905; at. no.: 55; sp. gr.: 1.9 at 20°C; melts at 28.5°C.
[1861; < Latin caesium, neuter of caesius bluish gray (see -ium2); so named from the blue lines in its spectrum]
ThesaurusAntonymsRelated WordsSynonymsLegend:
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
цезий
cesium
cæsium
tseesium
cesium
צזיום
cezij
cézium
sesín
セシウム
caesium
cezis
cesium
cez
cesiu
cézium
cezij
cesium
sezyum

caesium

cesium (US) [ˈsiːzɪəm] Ncesio m

caesium

, (US) cesium
nCäsium nt, → Zäsium nt
References in periodicals archive ?
The improvements that we report in our paper have reduced significantly the caesium fountain clock's two largest sources of measurement uncertainties-Doppler shifts and the microwave-lensing frequency shift," said NPL Project Leader Krzysztof Szymaniec.
At present, Caesium fountain clocks are the most accurate clocks in the world, furnishing the second accurate to 15 places after the decimal point.
Contamination of soil and water by the radioactive form of caesium is a major problem, since it persists for a long time; levels of radioactivity reduce by half only every 30 years.