Thorium Oxide
Title: Thorium Oxide
CAS Registry Number: 1314-20-1
Additional Names: Thorium dioxide; thoria
Molecular Formula: O2Th
Molecular Weight: 264.04
Percent Composition: O 12.12%, Th 87.88%
Line Formula: ThO2
Literature References: Review: Keller in Comprehensive Inorganic Chemistry vol. 5, J. C. Bailar, Jr. et al., Eds. (Pergamon Press, Oxford, 1973) pp 221-223.
Properties: White, heavy, infusible, cryst powder; when heated is incandescent. d 10.0. mp 3390°. Insol in water or alkalies. Sol in acids with difficulty.
Melting point: mp 3390°
Density: d 10.0
 
Derivative Type: Suspension contg 20-25% ThO2
Trademarks: Thorotrast
Literature References: Reviews of tumor induction by Thorotrast: Looney, Am. J. Roentgenol. Radium Ther. Nucl. Med. 83, 163-185; Smoron, Battifora, Cancer 30, 1252-1259 (1972).
 
CAUTION: Thorium oxide is listed as a known human carcinogen: Report on Carcinogens, Eleventh Edition (PB2005-104914, 2004) p III-154.
Therap-Cat: Has been used as diagnostic aid (radiopaque medium).
Keywords: Diagnostic Aid (Radiopaque Medium).

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