Organ/tissue absorbed dose

Absorbed dose, $D$, averaged over an organ or tissue region, $T$, as:

$D_T=\frac{\epsilon_T}{m_T}$

Where $\epsilon_T$ is the mean total energy imparted in a tissue or organ $T$, and $m_T$ is the mass of that tissue or organ.

ICRP Publication 103, 2007

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from ICRP Publication 105, 2007

The mean absorbed dose $D_T$ to a target organ or tissue $T$ is the sum of the contributions, $D(T \leftarrow S)$, arising from nuclear transformations of the radionuclide in various source organs $S$, i.e.:

$D_t = \frac{1}{m_T}\int D\ dm$