High Quality Content by WIKIPEDIA articles! The compound is radioactive due to the radioactivity of thorium. Thorium dioxide can be used as a nuclear fuel. The high thermal stability of thorium dioxide allows applications in flame spraying and high temperature ceramics. Thorium dioxide was the primary ingredient in the X-ray contrast medium Thorotrast. Use of Thorotrast was abandoned when it was found to be a carcinogen, sometimes causing cholangiocarcinoma. Today, barium sulfate is the standard X-ray contrast agent. Thoria has the fluorite crystal structure. Few other binary dioxides have this structure: uranium dioxide, hafnium dioxide and cerium dioxide, not to mention plutonium dioxide. The band gap of thoria is about 6 eV.

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