Organ wT and Lifetime Attributable Risk (LAR) Used in Risk Calculations
| ICRP 103 Organ weighting factor, wT | BEIR VII LAR cancer incidence* | ||
| Target organ | 10-y-old girl | Sex- and age-averaged | |
| Colon | 0.12 | 158 | 135 |
| Lungs | 0.12 | 504 | 244 |
| Stomach wall | 0.12 | 72 | 42 |
| Ovaries | 0.08 | 73 | 45 |
| Urinary bladder wall | 0.04 | 152 | 104 |
| Esophagus | 0.04 | — | — |
| Liver | 0.04 | 20 | 21 |
| Brain | 0.01 | — | — |
| Salivary glands | 0.01 | — | — |
| Skin | 0.01 | — | — |
| Remainder | 0.12 | — | — |
| Red bone marrow | 0.12 | 86 | 92 |
| Bone surface | 0.01 | — | — |
↵* No. of excess cases for population of 100,000 receiving organ-absorbed dose of 0.1 Gy.