| naturally | 11 | manner |
| throughout the united states | 7 | location |
| primarily | 5 | degree |
| radon → be found in → soil | 47 |
| radon → be found in → the soil | 13 |
| radon → be present in → soil | 11 |
| radon → be present in → the soil | 11 |
| radon → be in → the soil | 7 |
| radon → be found in → most soils | 4 |
| radon → be associated with → soil | 3 |
| negative | neutral | positive |
| 0.252 | 0.695 | 0.053 |
| Raw frequency | 96 |
| Normalized frequency | 0.694 |
| Modifier score | 0.800 |
| Perplexity | 32.146 |