thorium oxide การใช้
- However, commercial monazite sands typically contain between 6 and 12 % thorium oxide.
- Thorianite is a rare mineral and may contain up to about 12 % thorium oxide.
- Thorium oxide was discovered by Friedrich W鰄ler in the mineral, which was found in Norway ( 1827 ).
- Later that year, Robert B . Owens and Ernest Rutherford, at McGill University in Montreal, noticed variations when trying to measure radiation from thorium oxide.
- Thorium occurs in several minerals, the most common being the rare earth-thorium-phosphate mineral, monazite, which contains up to about 12 % thorium oxide.
- They obtained 99 % pure thorium metal by reducing thorium chloride with sodium metal . } } A simpler method leading to even higher purity was discovered in 1927 by Marden and Rentschler, involving the reduction of thorium oxide with calcium when calcium chloride was present.
- Thorium Energy, Inc . has the mineral rights to approximately 1360 acres ( 5.5 sq km ) of it and states that they have proven thorium oxide reserves of 600 thousand tons and probable reserves of an additional 1.8 million tons within their claim.
- Although thorium was discovered in 1828, it had no applications until 1885, when Carl Auer von Welsbach invented the gas mantle, a portable source of light which produces light from the incandescence of very hot thorium oxide, heated to extremely high temperatures by burning gaseous fuels.