Tissue Weighting Factors Recommended by ICRP from 1979 to 2007
| Organ | ICRP 1979 | ICRP 1991 | ICRP 2007 |
|---|---|---|---|
| Gonads | 0.25 | 0.20 | 0.08 |
| Red marrow | 0.12 | 0.12 | 0.12 |
| Colon | 0.12 | 0.12 | |
| Lungs | 0.12 | 0.12 | 0.12 |
| Stomach | 0.12 | 0.12 | |
| Bladder | 0.05 | 0.04 | |
| Breasts | 0.15 | 0.05 | 0.12 |
| Liver | 0.05 | 0.04 | |
| Esophagus | 0.05 | 0.04 | |
| Thyroid | 0.03 | 0.05 | 0.04 |
| Skin | 0.01 | 0.01 | |
| Bone surfaces | 0.03 | 0.01 | 0.01 |
| Salivary glands, brain | 0.01 | ||
| Remainder of body | 0.30 | 0.05 | 0.12 |