| naturally | 28 | manner |
| throughout the united states | 5 | location |
| during the decay of uranium | 3 | temporal |
| radon → be found in → rock | 42 |
| radon → occur in → rock | 19 |
| radon → be present in → rock | 5 |
| radon → be generated in → rock | 4 |
| radon → be produced in → rock | 4 |
| radon → be associated with → rock | 3 |
| negative | neutral | positive |
| 0.279 | 0.672 | 0.049 |
| Raw frequency | 77 |
| Normalized frequency | 0.650 |
| Modifier score | 0.500 |
| Perplexity | 132.805 |