# 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

## Previous glossary entries

### from ICRP Publication 106, 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.:

$D_t = \sum_{S} D(T \leftarrow S)$

### 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 $r_T$ is given by:

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

where $m_T$ is the mass of the organ or tissue and $D$ is the absorbed dose in the mass element $dm$. The SI unit of mean absorbed dose is joule per kilogramme (J kg-1) 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 $D_T$ averaged over the tissue or organ $T$ which is given by:

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

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.