1.Member States shall ensure that new classes or types of practices resulting in exposure to ionising radiation are justified before being adopted.
2.Member States shall consider a review of existing classes or types of practices with regard to their justification whenever there is new and important evidence about their efficacy or potential consequences or new and important information about other techniques and technologies.
3.Practices involving occupational and public exposures shall be justified as a class or type of practice, taking into account both categories of exposures.
4.Practices involving medical exposure shall be justified both as a class or type of practice, taking into account medical and, where relevant, associated occupational and public exposures, and at the level of each individual medical exposure as specified in Article 55.