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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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[Cicero], IV, xlix 63: Effictio est cum exprimatur atque effingitur verbis corporis cuispiam forma quoad satis sit ad intellegendum, hoc modo: 'Hunc, iudices, dico, rubrum, brevem, incurvum, canum, subscrispum, caesium, cui sane magna esta in mento cicatrix.
The caesium isotopes have relatively longer half-lives and cause longer-term exposures through ingestion and external exposure from their deposition on the ground.
 
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