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The tissue weighted sum of dose equivalent to an organ or tissue from all specified organs and tissues of the body, given by the expression
<div style='text-align: center;'>
<math>
H_E = \displaystyle \sum_{T} w_tH_t
</math>
</div>
where H<sub>T</sub> is the dose equivalent to an organ or tissue T and w<sub>T</sub> is the tissue weighting factor. The SI unit of effective dose equivalent is joule per kilogramme (J kg<sup>-1</sup>), and its special name is sievert (Sv). A quantity introduced by ICRP in [[ICRP Publication 26|Publication 26]] (ICRP, 1977) and replaced by effective dose in [[ICRP Publication 60]] (ICRP, 1991).
''[[ICRP Glossary]] entry - May 2019''
<div style='text-align: center;'>
<math>
H_E = \displaystyle \sum_{T} w_tH_t
</math>
</div>
where H<sub>T</sub> is the dose equivalent to an organ or tissue T and w<sub>T</sub> is the tissue weighting factor. The SI unit of effective dose equivalent is joule per kilogramme (J kg<sup>-1</sup>), and its special name is sievert (Sv). A quantity introduced by ICRP in [[ICRP Publication 26|Publication 26]] (ICRP, 1977) and replaced by effective dose in [[ICRP Publication 60]] (ICRP, 1991).
''[[ICRP Glossary]] entry - May 2019''