Table 3. Tissue weighting factors for calculation of effective dose: ICRP 199013 and 20074 recommendations.
| Tissue |
1990 |
2007 |
| wT | wT | |
| Bone marrow | 0.12 | 0.12 |
| Breast | 0.05 | 0.12 |
| Colon | 0.12 | 0.12 |
| Lung | 0.12 | 0.12 |
| Stomach | 0.12 | 0.12 |
| Bladder | 0.05 | 0.04 |
| Oesophagus | 0.05 | 0.04 |
| Gonads | 0.20 | 0.08 |
| Liver | 0.05 | 0.04 |
| Thyroid | 0.05 | 0.04 |
| Bone surface | 0.01 | 0.01 |
| Brain | Remainder | 0.01 |
| Salivary glands | — | 0.01 |
| Skin | 0.01 | 0.01 |
| Remainder tissues | 0.05a | 0.12b |
aAdrenals, brain, upper large intestine, small intestine, kidney, muscle, pancreas, spleen, thymus and uterus; bAdrenals, extrathoracic region, gall bladder, heart, kidneys, lymphatic nodes, muscle, oral mucosa, pancreas, prostate, small intestine, spleen, thymus and uterus/cervix. (Text in italics refers to the remainder tissues used for calculation of maxillofacial dose)