"C1449"^^ . . "Thorium Dioxide"^^ . "ThortrastSYNCI" . . "UmbrathorBRNCI" . "9XA7X17UQC"^^ . . "ThorotrastSYNCI" . "ThO2"^^ . "Indicator, Reagent, or Diagnostic Aid"^^ . "Thorium DioxidePTNCI" . "Thorium AnhydrideSYNCI" . "ThoriaSYNCI" . "1314-20-1"^^ . "Thorium OxideSYNCI" . "FDA"^^ . "Hazardous or Poisonous Substance"^^ . "C0039995"^^ . "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.NCI" . "Thorotrast"^^ . . "Thorium Dioxide"^^ . . "THORIUM DIOXIDEPTFDA9XA7X17UQC" . "CHEBI:37339"^^ . "Inorganic Chemical"^^ .