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[[File:Glossary Icon-2.png|100px|frameless|right|link=ICRP Glossary]]
[[Absorbed dose]], <math>D</math>, averaged over an organ or tissue region, <math>T</math>, as:
<math>
== Previous glossary entries ==
=== from [[ICRP Publication 105106]], 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 = \fracsum_{1S}{m_T}\int D(T \ dmleftarrow S)
</math>
=== from [[ICRP Publication 116]], 2010; [[ICRP Publication 123]], 2013; [[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). The mean [[absorbed dose]] in an organ is sometimes termed organ dose.
=== from [[ICRP Publication 139]], 2007 ===
The [[absorbed dose]] <math>D_T</math> averaged over the tissue or organ <math>T</math> which is given by:
<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.