Legislation that is concerned with patient protection. They replace POPUMET (Protection Of Patients Undergoing Medical Examination and Treatment) 1988. They provide new definitions of positions of responsibility for the employer, the IR(ME)R employer referrer, practitioner, and operator. The IR(ME)R employer (legal person) is responsible for radiation safety of the dental practice and for ensuring that staff conform to procedures and regulations relating to radiation safety. They are responsible for ensuring that staff receive appropriate training and updating. The IR(ME)R referrer is a registered doctor or dentist entitled to refer a patient for a medical exposure to a practitioner; the referer is responsible for ensuring sufficient clinical information is given regarding the need for a radiographic exposure to allow the practitioner to justify such an exposure. The IR(ME)R practitioner is a registered doctor or dentist who is entitled to justify the medical exposure. They should be adequately trained to allow them to take decisions and responsibility for the justification of every medical exposure. The IR(ME)R operator is a suitably trained individual who conducts any practical aspect of the medical exposure; this includes the positioning of the x-ray tube, the choice of exposure factors, and the developing of the image receptor.