出典:Wikipedia
出典:『Wikipedia』 (2011/06/08 16:38 UTC 版)
Thorium dioxide (ThO2), also called thorium(IV) oxide is a white, crystalline powder. It was formerly known as thoria or thorina. It is produced mainly as a by-product of lanthanide and uranium production. Thorianite is the name of the mineralogical form of thorium dioxide. It is moderately rare and crystallizes in isometric system.