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caesium

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caesium

Soft, silvery-white, ductile metallic element, atomic number 55, relative atomic mass 132.905. It is one of the alkali metals that form Group 1 of the periodic table of the elements. The alkali metals increase in reactivity down the group, and caesium, with only the short-lived radioactive francium below it, is the most reactive of them all. In air it ignites spontaneously, and it reacts violently with water. It is the most electropositive of all the elements. It is used in the manufacture of photocells.

The rate of vibration of caesium atoms has been used as the standard of measuring time. Its radioactive isotope Cs-137 (half-life 30.17 years) is a product of fission in nuclear explosions and in nuclear reactors; it is one of the most dangerous waste products of the nuclear industry, being a highly radioactive biological analogue of potassium.

It was named in 1860 by the German chemist Robert Bunsen, after the blueness of its spectral line.
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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.
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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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