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Topic: Caesium


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  Caesium - LoveToKnow 1911
Caesium is found in the mineral springs of Frankenhausen, Montecatini, di Val di Nievole, Tuscany, and Wheal Clifford near Redruth, Cornwall (W. Miller, Chem.
The platino-chlorides are reduced by hydrogen, and the caesium and rubidium chlorides extracted by water.
Caesium hydroxide, Cs(OH) 2, obtained by the decomposition of the sulphate with baryta water,is a greyish-white deliquescent solid,which melts at a red heat and absorbs carbon dioxide rapidly.
www.1911encyclopedia.org /Caesium   (804 words)

  
 NationMaster - Encyclopedia: Caesium
Caesium is used as a catalyst in the hydrogenation of certain organic compounds.
Caesium fluoride is widely used in organic chemistry as a base and as a source of anhydrous fluoride ion.
The primary compounds of caesium are caesium chloride and its nitrate.
www.nationmaster.com /encyclopedia/Caesium   (6141 words)

  
 Cesium/Caesium
Caesium 137, recovered from waste of atomic plants is used as a gamma-ray emitter; it has a half-life of 33 years.
Caesium is used in atomic clocks, where a loss of 5s over 300 years is achievable.
Caesium may also be used as a catalyst for hydrogenation of certain organic compounds.
www.azom.com /details.asp?ArticleID=593   (325 words)

  
 Caesium
Caesium is a soft metal which is often liquid at room temperature due to its relatively low melting point (28.5°C).
Caesium is also used in atomic clocks, a standard measure of time, based on the caesium ion resonance of 9,192,631,770 Hz.
Caesium (Latin caesius meaning "sky blue") was spectroscopically discovered by Robert Bunsen and Gustav Kirchhoff in 1860 in mineral water from Durkheim, Germany.
www.lycos.com /info/caesium.html   (602 words)

  
 Caesium
Caesium is also the most electropositive and most alkaline of the stable chemical elements and also has the lowest ionization potential of all the elements, except for francium.
The primary compounds of caesium are its chloride and its nitrate.
Caesium, being one of the heavier alkaline metals, is also one of the most reactive and is highly explosive in cold water.
www.dejavu.org /cgi-bin/get.cgi?ver=93&url=http%3A%2F%2Farticles.gourt.com%2Fen%2Fcaesium   (1152 words)

  
  Caesium - Search Results - ninemsn Encarta
In group 1 (or Ia) of the periodic table, caesium is one of the alkali...
Pollution (quotations): Pollution: This spring a lamb sips caesium on a Welsh…
This spring a lamb sips caesium on a Welsh hill.
au.encarta.msn.com /Caesium.html   (115 words)

  
  Caesium - Wikipedia, the free encyclopedia
Caesium is also the most electropositive and most alkaline of the stable chemical elements and also has the lowest ionization potential of all the elements, except for francium.
Caesium fluoride is widely used in organic chemistry as a base and as a source of anhydrous fluoride ion.
The primary compounds of caesium are its chloride and its nitrate.
en.wikipedia.org /wiki/Caesium   (1078 words)

  
 CAESIUM - LoveToKnow Article on CAESIUM   (Site not responding. Last check: )
Caesium hydroxide, Cs(OH),, obtained by the decomposition of the sulphate with baryta water,is a greyish-white deliquescent solid,which melts at a red heat and absorbs carbon dioxide rapidly.
Caesium nitrate, CsNO1, is obtained by dissolving the carbonate in nitric acid, and crystallizes in glittering prisms, which melt readily, and on heating evolve oxygen and leave a residue of caesium nitrite.
Caesium compounds can be readily recognized by the two bright blue lines (of wave length 4555 and 4593) in their flame spectrum, but these are not present in the spark spectrum.
88.1911encyclopedia.org /C/CA/CAESIUM.htm   (758 words)

  
 Learn more about Caesium in the online encyclopedia.   (Site not responding. Last check: )
Caesium (also spelled cesium, and pronounced /'siːzɪəm/) is a chemical element in the periodic table that has the symbol Cs and atomic number 55.
Caesium is also the most electropositive and most alkaline chemical element and also has the least ionization potential of all the elements.
Caesium (Latin caesius meaning "sky blue") was spectroscopically discovered by Robert Bunsen and Gustav Kirchhoff in 1860 in mineral water from Durkheim.
www.onlineencyclopedia.org /c/ca/caesium.html   (810 words)

  
 Caesium - Article from FactBug.org - the fast Wikipedia mirror site
Caesium is also the most electropositive and most alkaline chemical element and also has the least ionization potential of all the elements, except for francium.
caesium fluoride is widely used in organic chemistry as a base and as a source of anhydrous fluoride ion.
The primary compounds of caesium are its chloride and its nitrate.
www.factbug.org /cgi-bin/a.cgi?a=5879   (888 words)

  
 Element Caesium, Cs, Alkali Metal
Ber., 1860) although caesium salts had undoubtedly been examined before, but had been mistaken by C. Plattner for potassium salts, meanwhile it was consisting of hydrous caesium and aluminium silicate.
Caesium is a trace element: it may be found dispersed in many rocks with concentrations of thousandths of a percent; negligibly small amounts of this element have been found also in seawater.
Caesium is slightly toxic, its biological role is not clear.
cs-caesium.info   (348 words)

  
 Seasonal Variation of Caesium-137 from Fallout in a Clam, Rangia cuneata Gray
Although caesium is not a biologically important trace element, chemically it resembles potassium, which is the principal cation of cytoplasm.
Whereas the concentration of caesium in marine organisms is usually about three to thirty times higher than in the surrounding water, the concentration for similar organisms in fresh water may be higher by a factor of 100–1,000 (ref. 5).
showed that the biological concentrations of caesium and potassium were directly related and that the concentration factors of both elements were inversely related to the salinity of the water.
www.nature.com /nature/journal/v215/n5107/abs/2151270a0.html   (338 words)

  
 Deadly Soviet Caesium Is Missing
Large boxes of powdered caesium 137, a powerfully radioactive substance, are lost in the former Soviet Union.
These caesium sources are a major reason why the US has committed at least $25 million in 2002 to an urgent effort to track lost radioactive sources in former Soviet states, as New Scientist reported on Thursday.
But because the caesium was used entirely as a source of radiation, it remained enclosed within the mobile gamma sources.
www.rense.com /general26/cs.htm   (405 words)

  
 Caesium
Caesium metal is an alkali metal that is the softest of all metal.
When caesium reacts with water, hydrogen gas is released and is very flammable as a result of the reaction.
Caesium can also be obtained by making a reaction occur between caesium chloride and metallic sodium.
web1.caryacademy.org /chemistry/rushin/StudentProjects/ElementWebSites/caesium/caesium.htm   (323 words)

  
 SignOnSanDiego.com > News > World -- Ukraine secret police seize radioactive caesium
Nuclear experts say caesium powder would be ideal for a so-called "dirty bomb," a conventional explosive laced with radioactive material.
Caesium is a highly-toxic radioactive substance that can explode in very cold water but is used in agriculture and in atomic clocks.
Caesium was responsible for the world's second worst civilian nuclear contamination disaster after Chernobyl.
www.signonsandiego.com /news/world/20040507-0747-ukraine-caesium.html   (410 words)

  
 Caesium - Search Results - MSN Encarta
In group 1 (or Ia) of the periodic table, caesium is one of the alkali...
Pollution (quotations): Pollution: This spring a lamb sips caesium on a Welsh…
This spring a lamb sips caesium on a Welsh hill.
uk.encarta.msn.com /Caesium.html   (110 words)

  
 Deadly Soviet caesium is missing - 21 June 2002 - New Scientist
Large boxes of powdered caesium 137, a powerfully radioactive substance, are lost in the former Soviet Union.
These caesium sources are a major reason why the US has committed at least $25 million in 2002 to an urgent effort to track lost radioactive sources in former Soviet states, as New Scientist reported on Thursday.
But because the caesium was used entirely as a source of radiation, it remained enclosed within the mobile gamma sources.
www.newscientist.com /article.ns?id=dn2445   (529 words)

  
 NPL Time Metrology
In a caesium clock a beam of atoms is produced by heating a small amount of caesium to around 100°C in an oven.
When the frequency of the light emitted by one of these lasers is tuned onto a transition frequency in caesium atoms, such as one of those around 852 nm, the laser beam can be used to manipulate the internal states of the atoms.
Using a synthesiser it is possible to offset the output frequency of the DRO from the locking value to the caesium transition frequency with millihertz resolution.
www.npl.co.uk /time/background/csfreq_standard.html   (3358 words)

  
 Patent 5945119
Various preparations for treating or relieving pain in a patient are disclosed wherein preparations containing caesium ions, preferably in the form of caesium chloride, and preferably also magnesium ions in the form of magnesium sulphate, are administered externally or internally to the patient.
A preparation containing these preferred amounts of caesium chloride and magnesium sulphate may be obtained by immersing 360 m of a microporous strip 10 cm wide in one liter of an aqueous solution containing 36-72 g/l of caesium chloride and 18-72 g/l of magnesium sulphate, and then drying the microporous strip.
A pharmaceutical preparation consisting of caesium ions and magnesium ions, as therapeutically active ingredients, and a carrier for topical administration to a patient wherein the preparation comprises an absorbent material impregnated with caesium ions and magnesium ions.
www.pharmcast.com /Patents/083199og/5945119_caesium090899.htm   (748 words)

  
 Caesium units to be used
Based on documents from a report submitted to the GPHC’s administration by a physicist, which were seen by this newspaper, it was reported that some of the components were missing and that there might have been a leak of radioactive material in the container where the machines are being stored.
Regretting what it said was the “present state of confusion pertaining to the caesium equipment”, the hospital’s statement confirmed that the government purchased Caesium-137 machines and they were at the hospital.
The statement said the building that was being constructed was not merely for the use of the caesium, but for a complete cancer centre that would have included the use of cobalt.
www.landofsixpeoples.com /news304/ns310312.htm   (745 words)

  
 Caesium iodide - Wikipedia, the free encyclopedia
Caesium iodide (CsI) is an ionic compound often used as the input phosphor of an x-ray image intensifier tubes found in fluoroscopy equipment.
An important application of caesium iodide crystals, which are scintillators, is electromagnetic calorimetry in experimental particle physics.
Pure CsI is a fast and dense scintillating material with relatively high light yield.
en.wikipedia.org /wiki/Caesium_iodide   (119 words)

  
 Chemistry : Periodic Table : caesium : key information   (Site not responding. Last check: )
Caesium, gallium, and mercury are the only three metals that are liquid at or around room temperature.
Caesium reacts explosively with cold water, and reacts with ice at temperatures above -116°C. Caesium hydroxide is a strong base and attacks glass.
This is an equilbrium reaction and under these conditions the caesium is highly volatile and removed from the system in a form relatively free from sodium impurities, allowing the reaction to proceed.
www.webelements.com /webelements/elements/text/Cs/key.html   (328 words)

  
 Radiotherapy by caesium insertion
This page tells you about insertion of caesium or iridium - types of internal radiotherapy used for treating cancer of the cervix, womb (also called uterine or endometrial cancer) and vagina.
The side effects of caesium or irridium insertion are the same as those explained in the CancerHelp UK section on radiotherapy - stomach and abdominal side effects.
There is a small risk of infection after caesium or irridium insertion but it's rare.
www.cancerhelp.org.uk /help/default.asp?page=3614   (1072 words)

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