A questionnaire based on recommendations issued by professional societies in the field of interventional radiology and cardiology [1,2] as well as by international organisations [3] was developed and disseminated among physicians and radiographers who perform interventional procedures at four university hospitals. The questionnaire contained 42 questions which were related to individual exposure monitoring, means of staff and patient radiation protection and previous ways of acquiring the knowledge regarding radiation protection. At the same time, the questionnaire gave the participant of the survey the opportunity to assess his/her own knowledge. Questions were mostly in the form of multiple-choice questions.