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Radiation weighting factor

The quantity radiation weighting factor (wR) expresses the biological effectiveness of radiation for producing stochastic effects. The corresponding unit is sievert per becquerel (Sv/Bq). The radiation weighting factor is used in the conversion from absorbed dose (D) to equivalent dose (H).

radiation type
energy (MeV)
radiation weighting factor (wR)
photon
1
electron
1
neutron
< 1
2.5 - 22
1 - 50
22 - 5.5
> 50
5.5 - 2.5
proton
2
heavy particle
20

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Last modified:28 October 2025 3.24 p.m.
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