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[[File:Glossary Icon-2.png|100px|frameless|right|link=ICRP Glossary]]
A quantity that, when multiplied by a measurement of radionuclide intake, air [kerma], particle [fluence], or environmental radioactivity concentration, will yield an organ [equivalent dose ] or the [effective dose ] to the exposed individual. Sometimes referred to as [[dose conversion coefficient]] or factor.
'''Return to [[ICRP Glossary|Glossary]]'''
== Previous glossary entries ==
=== from [[ICRP Publication 139]], 2018 ===
Used to express dose per unit intake of a radioactive substance but sometimes also used to describe other coefficients linking quantities or concentrations of activity to doses or dose rates such as the external dose rate at a specified distance above a surface with a deposit of a specified activity per unit area of a specified radionuclide.
=== from [[ICRP Publication 136]], 2017 ===
(for non-human biota) A coefficient relating an absorbed dose rate in the whole body or in a part of it and radionuclide activity concentration in the body for internal exposure or in the environment in the case of external exposures. In this publication for exposure to internally distributed sources DCs are formulated in units of dose rate (μGy h<sup>-1</sup>) per unit activity concentration in the body (Bq kg<sup>-1</sup>) while for external exposures these dose rates are given as per unit mass (Bq kg<sup>-1</sup>) surface (Bq m<sup>-2</sup>) or volume (Bq L<sup>-1</sup>) or Bq m^<sup>-3</sup>) activity concentrations. As recommended by ICRP and applied previously to dosimetric data for humans the term ‘dose coefficients’ replaces the previously used terms ‘dose conversion coefficients’ and ‘dose conversion factors’ thus resulting in harmonised dosimetric terminology across the ICRP publications.
=== from [[ICRP Publication 130]], 2015 and [[ICRP Publication 133]], 2016 ===
For adults a dose coefficient is defined as either the committed equivalent dose in tissue T per activity intake h<sub>T</sub>(50) or the committed effective dose per activity intake e(50) where 50 is the dose-commitment period in years over which the dose is calculated. Note that elsewhere the term ‘dose per intake coefficient’ is sometimes used for dose coefficient.
=== from [[ICRP Publication 119]], 2012 ===
Committed tissue equivalent dose per unit acute intake h<sub>T</sub>(τ) or committed effective dose per unit acute intake e(τ), where s is the time period in years over which the dose is calculated [e.g. e(50)].
=== from [[ICRP Publication 110]], 2008 ===
Used as a generic term for coefficients relating a dose quantity to another physical quantity, both for internal and external radiation exposure. In internal dosimetry, a typical dose coefficient is the dose per unit intake of a radioactive substance; in external dosimetry, these are dose conversion coefficients.
=== from [[ICRP Publication 113]], 2007 and [[ICRP Publication 120]], 2012 ===
Used as a synonym for dose per unit intake of a radioactive substance, but sometimes also used to describe other coefficients linking quantities or concentrations of activity to doses or dose rates, such as the external dose rate at a specified distance above a surface with a deposit of a specified activity per unit area of a specified radionuclide.