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D_t = \sum_{S} D(T \leftarrow S)
</math>
=== from [[ICRP Publication 130]], 2015 and [[ICRP Publication 133]], 2016 ===
The mean absorbed dose in a specified organ or tissue region <math>r_T</math> is given by:
<math>
D_T = \frac{1}{m_T} \int D\ dm
</math>
where <math>m_T</math> is the mass of the organ or tissue and <math>D</math> is the absorbed dose in the mass element <math>dm</math>. The SI unit of mean absorbed dose is joule per kilogramme (J kg<sup>-1</sup>) and its special name is [[gray]] (Gy).
