Tissue weighting factor
 scroll 
Different probabilities exist for the occurrence of stochastic radiation
effects in various organs and tissues. This different sensitivity
to stochastic radiation damage is considered in the ICRP Publication
60, in the Euratom basic standards for
Radiation Protection dated May 1996 by the tissue weighting factor in
calculations of the effective dose. To calculate the effective dose,
the individual organ dose values are multiplied by the respective tissue
weighting factor and the products added.
Organ |
Tissue weighting factor T |
Gonads |
0.20 |
Colon |
0.12 |
Bone marrow (red) |
0.12 |
Lung |
0.12 |
Stomach |
0.12 |
Bladder |
0.05 |
Chest |
0.05 |
Liver |
0.05 |
Thyroid gland |
0.05 |
Oesophagus |
0.05 |
Skin |
0.01 |
Bone surface |
0.01 |
Adrenals, brain, small intestine, kidney, muscle,
pancreas, spleen, thymus, uterus
(the weighting factor 0.05 is applied to the average
dose of these organs) |
0.05 |
Tissue weighting factors (ICRP Publ. 60, EU BSS 1996)
The numerical values indicated above are valid legal EU-regulations for calculation of the effective dose. In 2007 ICRP published a new set of tissue weighting factors (ICRP Publ. 103: The 2007 Recommendations of the International Commission on Radiological Protection) given below. These data are adopted in the proposal of the new EU Basic Safety Standards (European Commission, Proposal for a Council Directive, COM(2011) 593 final, 2011-09-29) for approval by the Council of the European Union.
Tissue |
Tissue weighting factor wT |
Σ wT |
Bone-marrow (red), Colon, Lung, Stomach, Breast, Remainder tissues* |
0.12 |
0.72 |
Gonads |
0.08 |
0.08 |
Bladder, Oesophagus, Liver, Thyroid |
0.04 |
0.16 |
Bone surface, Brain, Salivary glands, Skin |
0.01 |
0.04 |
|
Total |
1.00 |
* Remainder tissues:
Adrenals, Extrathoracic (ET) region, Gall bladder, Heart, Kidneys, Lymphatic nodes, Muscle, Oral mucosa, Pancreas, Prostate (♂), Small intestine, Spleen, Thymus,
Uterus/cervix (♀) |
|
|
Tissue weighting factors (ICRP 2007)
back
|
|
11 - 15 March 2018
Munich, Germany
30 September - 04 October 2018
Prague, Czech Republic |
