Changes

(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^-1) per unit activity concentration in the body (Bq kg^-1) while for external exposures these dose rates are given as per unit mass (Bq kg^-1) surface (Bq m^-2) or volume (Bq L^-1) or Bq m^^-3) 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.