| soil | 0.29 |
| india | 0.25 |
| the earth’s crust | 0.25 |
| water | 0.25 |
| occur in thorite | 0.50 |
| occur in monazite | 0.45 |
| absorb neutron | 0.45 |
| replace uranium | 0.40 |
| tarnish in air | 0.40 |
| form thorium dioxide | 0.38 |
| decay into lead | 0.29 |
| found application | 0.27 |
| occur in several minera… | 0.25 |
| decay into various othe… | 0.25 |
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| low work-function | 0.29 |
| high electron emission | 0.29 |
| half-life of 14 billion… | 0.25 |
| longer fuel cycle | 0.16 |
| radioactive | 0.68 |
| fertile | 0.60 |
| common | 0.56 |
| more abundant than uran… | 0.56 |
| safer | 0.53 |
| abundant | 0.52 |
| more abundant | 0.44 |
| recoverable | 0.43 |
| cheap | 0.39 |
| silvery | 0.38 |
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| element | 0.49 |
| electropositive actinide | 0.25 |
| used as fuel | 0.60 |
| extracted | 0.55 |
| used as nuclear fuel | 0.52 |
| found as thorium-232 | 0.49 |
| used as alloying element | 0.42 |
| mixed with enriched ura… | 0.42 |
| discovered in 1828 | 0.40 |
| mined | 0.36 |
| stored | 0.36 |
| attacked by water | 0.33 |
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