| soil | 0.64 |
| the earth | 0.61 |
| water | 0.54 |
| rock | 0.53 |
| many regions of the cou… | 0.52 |
| the ground | 0.49 |
| building | 0.45 |
| outdoor air | 0.41 |
| granite | 0.40 |
| every state | 0.39 |
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| move up through the gro… | 0.68 |
| enter building | 0.66 |
| move up through crack | 0.66 |
| enter home | 0.65 |
| move up through other h… | 0.64 |
| get into the air | 0.61 |
| enter the home | 0.61 |
| affect on average 10-40… | 0.60 |
| accumulate in basement | 0.55 |
| occur in the environment | 0.54 |
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| 21,000 deaths | 0.29 |
| death | 0.19 |
| about 14,000 deaths per… | 0.19 |
| half-life of 3.8 days | 0.40 |
| color | 0.32 |
| short half-life | 0.29 |
| big impact | 0.25 |
| dangerous | 0.63 |
| more prevalent | 0.61 |
| radioactive | 0.61 |
| troublesome | 0.57 |
| colorless | 0.55 |
| tasteless | 0.52 |
| invisible | 0.50 |
| harmful | 0.47 |
| inert | 0.45 |
| highest | 0.44 |
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| occurring gas | 0.76 |
| gas | 0.61 |
| occurring radioactive g… | 0.60 |
| radioactive gas | 0.57 |
| cancer-causing radioact… | 0.57 |
| colorless, odorless gas | 0.48 |
| noble gas | 0.45 |
| tasteless gas | 0.43 |
| naturally-occurring rad… | 0.43 |
| invisible gas | 0.42 |
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| released into the air | 0.66 |
| present in the air | 0.65 |
| noted to be prevalent | 0.63 |
| removed | 0.62 |
| released | 0.60 |
| reduced | 0.55 |
| managed through radon m… | 0.55 |
| produced | 0.55 |
| tested | 0.55 |
| treated at the source | 0.52 |
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