Radiation Protection Regulations (SOR/2000-203)
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Regulations are current to 2025-06-25 and last amended on 2021-01-01. Previous Versions
SCHEDULE 1(Subsection 1(1))
Organ or Tissue Weighting Factors
| Column 1 | Column 2 | |
|---|---|---|
| Item | Organ or Tissue | Weighting Factor |
| 1 | Gonads (testes or ovaries) | 0.08 |
| 2 | Red bone marrow | 0.12 |
| 3 | Colon | 0.12 |
| 4 | Lung | 0.12 |
| 5 | Stomach | 0.12 |
| 6 | Bladder | 0.04 |
| 7 | Breast | 0.12 |
| 8 | Liver | 0.04 |
| 9 | Esophagus | 0.04 |
| 10 | Thyroid gland | 0.04 |
| 11 | SkinFootnote for Organ or Tissue Weighting Factors1 | 0.01 |
| 12 | Bone surfaces | 0.01 |
| 13 | Brain | 0.01 |
| 14 | Salivary glands | 0.01 |
| 15 | All organs and tissues not listed in items 1 to 14 (remainder organs and tissues) collectively, namely the adrenals, extra-thoracic region, gallbladder, heart, kidneys, lymphatic nodes, muscle, oral mucosa, pancreas, small intestine, spleen, thymus and prostate or uterus/cervixFootnote for Organ or Tissue Weighting Factors2,Footnote for Organ or Tissue Weighting Factors3 | 0.12 |
| 16 | Whole body | 1.00 |
Return to footnote 1The weighting factor for skin applies only when the skin of the whole body is exposed.
Return to footnote 2The weighting factor for the remainder organs and tissues applies to the arithmetic mean dose of the 13 remainder organs and tissues.
Return to footnote 3Hands, feet and the lens of an eye have no weighting factor.
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