The expert is a mediator between the relevant governmental institution on the one hand and the x-ray equipment manufacturers on the other. The physician can approach the expert in all matters concerning radiation protection. It is only by mutual cooperation between physician, governmental body, manufacturer and expert that the new x-ray regulations can be implemented and enforced. Of course we cannot influence the natural exposure to radiation that has been going on ever since the creation of the Earth. It is the task of radiation protection to keep artificial radiation exposure of the population as low as possible. Every person is expected to contribute towards achieving this aim.