Council Directive 2013/59/EuratomShow full title

Council Directive 2013/59/Euratom of 5 December 2013 laying down basic safety standards for protection against the dangers arising from exposure to ionising radiation, and repealing Directives 89/618/Euratom, 90/641/Euratom, 96/29/Euratom, 97/43/Euratom and 2003/122/Euratom

ANNEX II

Radiation and tissue weighting factors as referred to in points (25) and (33) of Article 4

A. Radiation weighting factors
Note: All values relate to the radiation incident on the body or, for internal radiation sources, emitted from the incorporated radionuclide(s).
Radiation typewR
Photons1
Electrons and muons1
Protons and charged pions2
Alpha particles, fission fragments, heavy ions20
Neutrons, En < 1 MeV
Neutrons, 1 MeV ≤ En ≤ 50 MeV
Neutrons, En > 50 MeV
B. Tissue weighting factors
a

The wT for the remainder tissues (0,12) applies to the arithmetic mean dose of the 13 organs and tissues for each sex listed below. Remainder tissues: adrenals, extrathoracic (ET) region, gall bladder, heart, kidneys, lymphatic nodes, muscle, oral mucosa, pancreas, prostate (male), small intestine, spleen, thymus, uterus/cervix (female).

TissuewT
Bone-marrow (red)0,12
Colon0,12
Lung0,12
Stomach0,12
Breast0,12
Remainder tissuesa0,12
Gonads0,08
Bladder0,04
Oesophagus0,04
Liver0,04
Thyroid0,04
Bone surface0,01
Brain0,01
Salivary glands0,01
Skin0,01