Umbrathor
PubChem Notes:
Thorium Dioxide 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.
Thoria - definition from Biology-Online.org
[(Science: chemistry) A rare white earthy substance, consisting of the oxide of thorium; formerly called also thorina. Origin: NL. See Thorite.
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