Tissue weighting factor
The dimensionless quantity tissue weighting factor (wT) represents the fraction of health risk attributable to the specific tissue or organ. The factors are normalized:
∑ wT = 1
|
organ
|
tissue weighting factor (wT)
|
|---|---|
|
breast tissue
|
0.12
|
|
large intestine
|
0.12
|
|
lungs
|
0.12
|
|
stomach
|
0.12
|
|
red bone marrow
|
0.12
|
|
gonads
|
0.08
|
|
bladder
|
0.04
|
|
liver
|
0.04
|
|
thyroid
|
0.04
|
|
oesophagus
|
0.04
|
|
bone surface
|
0.01
|
|
brain
|
0.01
|
|
skin
|
0.01
|
|
salivary glands
|
0.01
|
|
remainder group
|
0.12
|
The remainder group consists of the following 13 organs: pancreas, uterus/cervix or prostate, adrenal glands, small intestine, extra thoracic region, gall bladder, heart, lymph nodes, spleen, oral mucosa, kidneys, skeletal muscle, and thymus.
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Last modified:28 October 2025 2.58 p.m.
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