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Strontium

History
 
For the first time the metal has been detected in a lead mine in the Swedish village of Stronshian. This place gave later the name of metal. Strontium oxide was obtained in 1790 British scientists Kryuykshenkom W. and A. Crawford. Elemental strontium was poluchenv 1808 english scientist Humphrey Davey by amalgam strontium land. Matt glaze strontium was invented in 1920 by American explorer Hill. It was cheaper than applying at that time lead.
 
Nowadays

The most dangerous to humans is strontium-90. It has half-life 27.7 years. The most sensitive section of the living organisms is the bone marrow. Effect of strontium on it can lead to such diseases as cancer and leucaemia bones. The main consumer of strontium is a nuclear industry. In addition, strontium and its compounds are used in medicine, which is used for the manufacture of applicators used in the treatment of eye and skin diseases. Strontium is used in radiotherapy, with smelting of copper and bronze are used for cleaning it of impurities. Strontium oxide used in the production of color TVs. Pyrotechnics used strontium because of its carmine-red color during combustion. Strontium compounds are used as chemical sources of current.

Date ASIA EUROPE USA
26/12/2009 505 505 505
19/12/2009 4.85-4.86 4.85-4.86 4.85-4.86
12/12/2009 4.85-4.86 4.85-4.86 4.85-4.86
05/12/2009 5.05 5.05 5.05
28/11/2009 5.05 5.05 5.05
21/11/2009 5.05 5.05 5.05
14/11/2009 5.05 5.05 5.05
07/11/2009 5.05 5.05 5.05
31/10/2009 5.05 5.05 5.05
24/10/2009 5.05 5.05 5.05
17/10/2009 5.05 5.05 5.05
10/10/2009 5.05 5.05 5.05
02/10/2009 5.05 5.05 5.05
25/09/2009 5.05 5.05 5.05
18/09/2009 5.05 5.05 5.05
12/09/2009 5.05 5.05 5.05
05/09/2009 5.05 5.05 5.05
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