Inorganic Chemical
thorium dioxide
tho·ri·um di·ox·ide
Subclass of:
Thorium Compounds; Oxides
Definitions related to thorium dioxide:
  • A radioactive crystalline solid compound used in a broad range of industrial applications. Thorium dioxide was utilized as a radiographic contrast agent; however, it is no longer considered safe for use in human patients because it was found to be a carcinogen that can cause cholangiocarcinoma.
    NCI
    U.S. National Cancer Institute, 2021
  • Thorium oxide (ThO2). A radiographic contrast agent that was used in the early 1930s through about 1954. High rates of mortality have been linked to its use and it has been shown to cause liver cancer.
    NLM Medical Subject Headings
    U.S. National Library of Medicine, 2025
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