Thorium Compounds

Thorium Compounds

Thorium is a naturally occurring radioactive chemical element with the symbol Th and atomic number 90. It was discovered in 1828 by the Norwegian mineralogist Morten Thrane Esmark and identified by the Swedish chemist Jöns Jakob Berzelius and named after Thor, the Norse god of thunder.

Thorium produces a radioactive gas, radon-220, as one of its decay products. Secondary decay products of thorium include radium and actinium. In nature, virtually all thorium is found as thorium-232, which undergoes alpha decay with a half-life of about 14.05 billion years. Other isotopes of thorium are short-lived intermediates in the decay chains of higher elements, and only found in trace amounts. Thorium is estimated to be about three to four times more abundant than uranium in the Earth's crust, and is chiefly refined from monazite sands as a by-product of extracting rare earth metals.

Thorium was once commonly used as the light source in gas mantles and as an alloying material, but these applications have declined due to concerns about its radioactivity. Thorium is also used as an alloying element in nonconsumable TIG welding electrodes.

Canada, China, Germany, India, the Netherlands, the United Kingdom and the United States have experimented with using thorium as a substitute nuclear fuel in nuclear reactors. When compared to uranium, there is a growing interest in developing a thorium fuel cycle due to its greater safety benefits, absence of non-fertile isotopes and its higher occurrence and availability. India's three stage nuclear power programme is possibly the most well known and well funded of such efforts.

Read more about Thorium Compounds:  Applications, History, Occurrence, Thorium Extraction, Reserve Estimates, Dangers and Biological Roles, See Also

Other articles related to "thorium compounds, thorium":

Thorium Compounds - See Also
... Thorium fuel cycle Liquid fluoride thorium reactor Actinides in the environment India's three stage nuclear power programme Sylvania Electric Products explosion Thorotrast General Decay chain Energy amplifier ...
Applications - Thorium Compounds
... Thorium dioxide (ThO2) and thorium nitrate (Th(NO3)4) were used in mantles of portable gas lights, including natural gas lamps, oil lamps and camping lights ... Thorium dioxide is a material for heat-resistant ceramics, e.g ... Thorium dioxide was used to control the grain size of tungsten metal used for spirals of electric lamps ...

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