Chemicals and Drugs

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.

National Library of MedicineMedical Subject Headings2026

Structured Summary

Abstract

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.

Chemical Identity

Chemical Information

Molecular Formula
O2Th
Molecular Weight
264.036 g/mol
CAS Registry No.
1314-20-1
IUPAC Name
dioxothorium
InChIKey
ZCUFMDLYAMJYST-UHFFFAOYSA-N
SMILES
O=[Th]=O
MeSH Unique ID
D013911
Source
PubChem CID 14808

MeSH Record

Classification

Broader headings

Related Concepts

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Drug Class

Pharmacological Action

MeSH Record

Synonyms

4 entry terms
  • Thorium Oxide
  • Dioxide, Thorium
  • Oxide, Thorium
  • Thorotrast

MeSH Record

Aspects Covered

19 allowable subheadings

Indexed with the subheadings administration & dosage, adverse effects, analogs & derivatives, analysis, chemical synthesis, chemistry, classification, economics, history, isolation & purification, metabolism, pharmacokinetics, pharmacology, poisoning, radiation effects, standards, supply & distribution, therapeutic use, toxicity.

MeSH Record

History Note

65

MeSH Hierarchy

Tree Numbers

AMA Style

References

  1. National Library of Medicine. Thorium Dioxide. Medical Subject Headings (MeSH). 2026. Unique ID D013911. http://id.nlm.nih.gov/mesh/2026/D013911
  2. Thorium Dioxide. In: Wikipedia. https://en.wikipedia.org/wiki/Thorium_dioxide
  3. Thorium Dioxide. In: Wikidata. https://www.wikidata.org/wiki/Q420634
  4. Thorium Dioxide. In: PubChem Compound. CID 14808. https://pubchem.ncbi.nlm.nih.gov/compound/14808