| I (eV) | n (electrons/m3) |
| Density ρ (g/m3) | Substances |
| 75.2 | 3.476 × 1029 | 0.550 | 1050,000 | Lung |
| 70.3 | 3.383 × 1029 | 0.551 | 1020,000 | Breast |
| 75 | 3.482 × 1029 | 0.551 | 1050,000 | Ovary |