Tracked Changes. Medical electrical equipment. Particular requirements for the basic safety and essential performance of gamma beam therapy equipment|Control devices, Graduations, Medical equipment, Medical radiology, Components, Accident prevention, Environment (working), Electrical medical equipment, Safety engineering, Signal devices, Marking, Electrical safety, Safety measures, Direction of movement, Radiology apparatus (medical), Instructions for use, Electronic equipment and components, Radiation hazards, Electrical equipment, Radiotherapy, Radiation protection, Testing conditions, Radiology, Design, Documents, Therapeutics, Identification methods, Gamma-ray apparatus