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where D<sub>R,T</sub> is the mean absorbed dose from radiation R in a tissue or organ T, and w<sub>R</sub> is the radiation weighting factor. The SI unit of equivalent dose is joule per kilogram (J/kg<sup>-1</sup>), and its special name is sievert (Sv). ([[ICRP Publication 123]], 2013)
''[[ICRP Glossary]] entry - May 2019''
Β ===Previous Description===The equivalent dose to a tissue or organ is deο¬ned as: <div style='text-align: center;'><math>H_T = \displaystyle \sum_{R} w_RD_{R,T}</math></div>where π€π
is the radiation weighting factor for radiation type R, and π·π
,π is the organ absorbed dose from radiation type R in a tissue or organ ππ of the Reference Adult Male or the Reference Adult Female. As π€π
is dimensionless, the SI unit for the equivalent dose is the same as for absorbed dose, J kg-1, and its special name is sievert (Sv). (From [[ICRP Publication 130]], 2015)Β The equivalent dose to a tissue or organ is deο¬ned as: <div style='text-align: center;'><math>H_T = \displaystyle \sum_{R} w_RD_{R,T}</math></div>where π€π
is the radiation weighting factor for radiation type R, and π·π
,π is the organ absorbed dose from radiation type R in a tissue or organ ππ of the Reference Adult Male or the Reference Adult Female. As π€π
is dimensionless, the SI unit for the equivalent dose is the same as for absorbed dose, joule per kilogram (J kg-1) and its special name is sievert (Sv).(From [[ICRP Publication 133]], 2016)Β '''Return to [[ICRP Glossary|Glossary]] entry - May 2019'''