Definition: 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.
an early (1930-50) contrast medium; D25-26 qualif
Pharmacological ActionCarcinogens
Other names Thorium Oxide; Oxide, Thorium; Dioxide, Thorium; Thorotrast
