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 ?
By using microwaves to excite electrons from one energy level to another within atoms of caesium, he was able to stabilise the microwaves at a precise and reproducible frequency.
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.
Under Japanese Food Sanitation Law, 5,000 becquerel per kg (Bq/kg) of caesium is considered the safe limit in soil (caesium-137 makes up about half of total radioactive caesium).
The problem of contamination due to fallout from the Chernobyl accident is not going to go away as radioactive caesium has a half-life of thirty years.