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caesium

   Also found in: Dictionary/thesaurus, Medical, Wikipedia, Hutchinson 0.01 sec.
caesium (US), cesium
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


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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.
Soon, a portable optical atomic clock by Asian News International
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.
Italy recalls 'radioactive' wood pellets: report by AFP / AFP Global Edition
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.
Aftermath of disaster still affects farms; CHERNOBYL ANNIVERSARY by Daily Post (Liverpool, England)
 
 
 
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