Chemicals and Drugs

Thorium

A radioactive element of the actinide series of metals. It has an atomic symbol Th, atomic number 90, and atomic weight 232.04. It is used as fuel in nuclear reactors to produce fissionable uranium isotopes. Because of its radioopacity, various thorium compounds are used to facilitate visualization in roentgenography.

National Library of MedicineMedical Subject Headings2026

Structured Summary

Abstract

A radioactive element of the actinide series of metals. It has an atomic symbol Th, atomic number 90, and atomic weight 232.04. It is used as fuel in nuclear reactors to produce fissionable uranium isotopes. Because of its radioopacity, various thorium compounds are used to facilitate visualization in roentgenography.

Chemical Identity

Chemical Information

Molecular Formula
Th
Molecular Weight
232.038 g/mol
CAS Registry No.
7440-29-1
IUPAC Name
thorium
InChIKey
ZSLUVFAKFWKJRC-UHFFFAOYSA-N
SMILES
[Th]
MeSH Unique ID
D013910
Source
PubChem CID 23960

MeSH Record

Classification

Broader headings

Related Concepts

Knowledge Graph

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MeSH Record

Aspects Covered

19 allowable subheadings

Indexed with the subheadings administration & dosage, adverse effects, analysis, blood, cerebrospinal fluid, chemistry, classification, economics, history, isolation & purification, metabolism, pharmacokinetics, pharmacology, poisoning, standards, supply & distribution, therapeutic use, toxicity, urine.

MeSH Hierarchy

Tree Numbers

  1. D01w.268w.271w.100w.900w
  2. D01w.268w.556w.850w
  3. D01w.496w.749.305w.100w.900w
  4. D01w.552w.020w.889w
  5. D01w.552w.544w.850w

AMA Style

References

  1. National Library of Medicine. Thorium. Medical Subject Headings (MeSH). 2026. Unique ID D013910. http://id.nlm.nih.gov/mesh/2026/D013910
  2. Thorium. In: Wikipedia. https://en.wikipedia.org/wiki/Thorium
  3. Thorium. In: Wikidata. https://www.wikidata.org/wiki/Q1115
  4. Thorium. In: PubChem Compound. CID 23960. https://pubchem.ncbi.nlm.nih.gov/compound/23960