Absorbed dose, [math]D[/math], averaged over an organ or tissue region, [math]T[/math], as:
[math] D_T=\frac{\epsilon_T}{m_T} [/math]
Where [math]\epsilon_T[/math] is the mean total energy imparted in a tissue or organ [math]T[/math], and [math]m_T[/math] 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 [math]D_T[/math] to a target organ or tissue [math]T[/math] is the sum of the contributions, [math]D(T \leftarrow S)[/math], arising from nuclear transformations of the radionuclide in various source organs [math]S[/math], i.e.:
[math] D_t = \frac{1}{m_T}\int D\ dm [/math]