In professional areas where public safety is at stake and strict control of professional activities is necessary, it is common to register professionals. is is the case for most medical professions, and also increasingly common for other professionals in radiation oncology, such as medical physicists. Registration is also oen linked to the professional holding a license granted by a regulatory authority representing the interests of society. is system of licensure has been successfully used in many professional elds, for example, in radiation protection (IAEA 1996).