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Substance Name: Thorium dioxide
RN: 1314-20-1
UNII: 9XA7X17UQC
InChIKey: ZCUFMDLYAMJYST-UHFFFAOYSA-N

Note

  • 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.

Molecular Formula

  • O2-Th

Molecular Weight

  • 264.038
 

Classification Codes

Classification Codes

  • Carcinogens
  • Human Data
  • Noxae
  • Tumor Data

Superlist Classification Code

  • Known to be a Carcinogen

Names and Synonyms

Name of Substance

  • Thorium dioxide
  • Thorium oxide

MeSH Heading

  • Thorium dioxide

Synonyms

  • EINECS 215-225-1
  • HSDB 6364
  • Thoria
  • Thorianite
  • Thorium anhydride
  • Thorium dioxide
  • Thorium oxide
  • Thorium oxide (ThO2)
  • Thorium-232 dioxide
  • Thorotrast
  • Thortrast
  • Umbrathor
  • UNII-9XA7X17UQC

Systematic Names

  • Thorium dioxide
  • Thorium oxide
  • Thorium oxide (ThO2)

Superlist Names

  • Thorium dioxide
  • Thorium oxide

Registry Numbers

CAS Registry Number

  • 1314-20-1

FDA UNII

  • 9XA7X17UQC

Other Registry Numbers

  • 34321-99-8
  • 8006-33-5

System Generated Number

  • 0001314201

Structure Descriptors

InChI

1S/2O.Th

InChIKey

ZCUFMDLYAMJYST-UHFFFAOYSA-N

Smiles

[Th](=O)=O

Toxicity

Organism Test Type Route Reported Dose (Normalized Dose) Effect Source
rat LD50 intratracheal > 1140mg/kg (1140mg/kg)   Environmental Quality and Safety, Supplement. Vol. 1, Pg. 1, 1975.