Agent Name

Thorium dioxide

CAS Number

1314-20-1

Formula

O2-Th

Major Category

Physical/Radiation

Synonyms

Thorianite; Thorium anhydride; Thorium oxide; Thorium oxide (ThO2); Thorium-232 dioxide; Thorotrast; Thortrast; Umbrathor; [ChemIDplus]

Category

Radioactive Compounds

Description

White powder; [CAMEO]

Sources/Uses

"Used in high-temperature ceramics, gas mantles, nuclear fuel, flame spraying, crucibles, non-silica optical glass, catalysis, filaments in incandescent lamps, cathodes in electron tubes and arc-melting electrodes." [CAMEO] Has been used as a radiopaque material in diagnostic radiology; [Merck Index]

Comments

See "Thorium."

Exposure Assessment
Explanatory Notes

Insoluble in water; Soluble in hot H2SO4; mp = 3220 degrees C; [ATSDR ToxProfiles]

Links to Other NLM Databases
Health Studies

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Toxicity Information

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Processes

Industrial Processes with risk of exposure: