cesium


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ce·si·um

 (sē′zē-əm)
n. Symbol Cs
A soft, silvery-white ductile, metallic element that is the most electropositive and alkaline of the elements and is used in atomic clocks and photoelectric cells and to catalyze hydrogenation of some organic compounds. The fundamental unit of time in the International System, the second, is based on the frequency of radiation between two energy states in an atom of the Cs-133 isotope. Atomic number 55; atomic weight 132.905; melting point 28.44°C; boiling point 671°C; specific gravity 1.873; valence 1. See Periodic Table.
[From Latin caesius, bluish gray (from its blue spectral lines).]

cesium

(ˈsiːzɪəm)
n
(Elements & Compounds) the usual US spelling of caesium

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]

ce·si·um

(sē′zē-əm)
Symbol Cs A soft, easily shaped, silvery-white element that is an alkali metal. It is liquid at room temperature and is the most reactive of all metals. Cesium is used to make photoelectric cells, electron tubes, and atomic clocks. Atomic number 55. See Periodic Table.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.cesium - a soft silver-white ductile metallic element (liquid at normal temperatures)cesium - a soft silver-white ductile metallic element (liquid at normal temperatures); the most electropositive and alkaline metal
atomic number 55, caesium, Cs
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

ce·si·um

n. cesio, elemento metálico perteneciente al grupo de metales alcalinos.
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References in periodicals archive ?
Days and weeks after the accident, waves and tides brought the cesium in these highly contaminated waters onto the coast, where cesium became "stuck" to the surfaces of sand grains.
Radioactivity Under the Beach? POLLUTION FROM FUKUSHIMA DISASTER FOUND IN UNEXPECTED SPOT
The cesium levels in the brackish groundwater--a combination of fresh water and salt water--was ten times higher than what's currently being detected in the waters swirling around Fukushima's harbor, while cesium was tracked in the sand up to a depth of three feet.
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Because the plant strains identified are easy to harvest and dry, they could be potentially useful to recover radioactive cesium from a huge volume of radio-polluted water if cesium is dissolved in water.
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Cesium-137, the most common radioactive form of the metal cesium, is commonly used for the treatment of cancer and in a variety of gauges in the construction and drilling industries, but it can be used in nuclear weapon production as well.
Gendarmes seize radioactive substance in northern Turkey
Iodine was found at all 12 sites, including Seoul, while cesium was only detected in Chuncheon, 85 kilometers east of Seoul," KINS president Yun Choul-ho said at a news conference.
Traces of radioactive iodine, cesium detected in S. Korea
The team has developed two methods for filling and sealing the micromachined cells: chemical reaction between barium azide and cesium chloride in an ultrahigh vacuum system followed by anodic bonding of the silicon chip to a glass window in a nitrogen buffer gas ambient, and direct injection of liquid Cs in an anaerobic chamber followed by anodic bonding to a glass window in a nitrogen buffer gas ambient.
NIST microfabricates atomic vapor cells for Chip-Scale Atomic Clocks
The first episode had occurred during intravenous cesium treatment (2,000 mg four times a day for 2 weeks), with recurrences over the ensuing 2 months when he was taking 1,000-mg cesium capsules three times daily.
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The company did not assay for cesium, rubidium or lithium.
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The cesium atomic clock shares the distinction of being the most accurate clock in the world with a similar device in Paris after passing the evaluation tests, which demonstrated it is about three times more accurate than the atomic clock it replaces, NIST-7.
Ultra-Accurate Atomic Clock Unveiled at NIST Laboratory
For the past two decades, cesium beam standards have been almost the universal choice in applications requiring a long term frequency accuracy of better than 1 x |10.
A GPS primary reference clock
The focus on our rare metals project positions HLM in a market where demand is growing, supply is under pressure and our project is unique with both the occurrence of cesium and tantalum.
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The whole atomic clock system of these wristwatches are contained in a computer chip, while it still needs a cavity full of cesium gas.
Soon, atomic clocks that you can wear on your wrist

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