thorium

Radioaktivt, giftigt grundstof, nr. 90 idet periodiske system. der bl.a. anvendes til kernekraft, fordi metallet er mere almindeligt forekommende end uran.
Thorium-232 er "fertil". Når thorium-232 er blandet med et fissilt materiale såsom plutonium, kan blandingen (kaldet MOX-brændsel) anvendes til at køre en atomreaktor. Det er plutoniummet, der holder kædereaktionen i gang. Og mens det sker, at thorium-232 atomer absorberer neutroner, ændres de til uran-233 atomer. Thorium anvendes også i kernevåben:
Declassification of a Material in a Specified Weapon.
On January 14, 2008, the following information was declassified:
"Fact that thorium metal is used in the radiation case of the W71 warhead."
This bulletin will be incorporated into future changes or revisions to CG-W-5, Joint DOE/DoD Nuclear Weapons Classification Policy Guide, TCG-WM-1, Joint DOE/DoD Topical Classification Guide- Materials for the Nuclear Weapon Complex, and TCG-NAS-2, Joint DOE/DoD Topical Classification Guide for Nuclear Assembly Systems.
DOE, Office of Classification: Classification Bulletin, March 12, 2008. WNP-118.
- http://www.fas.org/sgp/othergov/doe/decl/thorium.pdf

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