# Equivalent dose

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The equivalent dose in an organ or tissue is given by:

$H_T = \sum_{R} w_RD_{R,T}$

where $D_{R,T}$ is the mean absorbed dose from radiation $R$ in a tissue or organ $T$, and $w_R$ is the radiation weighting factor. The SI unit of equivalent dose is joule per kilogram (J kg-1), and its special name is sievert (Sv).

(ICRP Publication 123, 2013)

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See also the ICRPaedia entry on absorbed, equivalent, and effective dose.

## Previous glossary entries

### from ICRP Publication 130, 2015

The equivalent dose to a tissue or organ is deﬁned as:

$H_T = \sum_{R} w_RD_{R,T}$

where $w_R$ is the radiation weighting factor for radiation type $R$, and $D_{R,T}$ is the organ absorbed dose from radiation type $R$ in a tissue or organ $r_T$ of the Reference Adult Male or the Reference Adult Female. As $w_R$ 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 133, 2016

The equivalent dose to a tissue or organ is deﬁned as:

$H_T = \sum_{R} w_RD_{R,T}$

where $w_R$ is the radiation weighting factor for radiation type $R$, and $D_{R,T}$ is the organ absorbed dose from radiation type $R$ in a tissue or organ $r_T$ of the Reference Adult Male or the Reference Adult Female. As $w_R$ 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).