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<math>
E = \sum_T w_T H_T = \sum_T w_T \sum_R w_R D_{T,R}
</math>
where <math>H_T</math> is the equivalent dose in a tissue or organ <math>T</math>, and <math>w_T</math> is the tissue weighting factor. The SI unit for effective dose is sievert (Sv) equal to J kg<sup>-1</sup>.
=== from [[ICRP Publication 127]], 2014 ===
The tissue-weighted sum of the equivalent doses in all specified tissues and organ sof the body given by the expression:
<math>
E = \sum_T w_T \sum W_R D_{T,R}
</math>
or:
<math>
E = \sum_T w_T \sum_R H_T
</math>
where <math>H_T</math> or <math>w_R D_{T,R}</math> is the equivalent dose in a tissue or organ <math>T</math>, and <math>w_T</math> is the tissue 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).
