Method and apparatus for positioning radiators

The invention relates to the positioning of a radiator (Q) relative to a detector (D). The relative position of the detector (D) to the radiator (Q) is determined, changes the position of the detector (d) and measuring the change in position by means of a detector arranged in the measuring means (M). Then, a change in the position of the detector (D) related information for a device (V) for positioning the emitter (Q) is provided, and changes the position of the radiator (Q) in accordance with the information.