 ICRP Publication 103 (2007), after two phases of international public consultation, has resulted in more continuity than change.Some recommendations remain because they work and are clear, others have been updated because understanding has evolved, some items have been added because there has been a void, and some concepts are better explained because more guidance is needed.In collaboration with the ICRU, the commission has assisted in defining the use of many of the dose quantities in the accompanying diagram.