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→from ICRP Publication 139, 2018
<math>
E = \sum_t sum_T w_T = \sum_T w_T \sum_R w_R D_{T,R}
</math>
where <math>w_T</math> is the tissue weighting factor for tissue or organ <math>T</math> and <math>w_R</math> is the radiation weighting factor. The unit for effective dose is the same as for absorbed dose J kg<sup>-1</sup> and its special name is sievert (Sv). The sum is performed over all organs and tissues of the human body considered to be sensitive to the induction of stochastic effects. The tissue weighting factors are age- and sex-averaged and intended to apply as rounded values to a population of both sexes and all ages.
=== from [[ICRP Publication 129]], 2015 ===