[Prefilter characteristics of modern x-ray tubes and their associated radiation relations].

Prefiltration characteristics of modern X-ray tube assemblies are stated. It is shown how the variation with the tube voltage of the aluminium equivalent of the inherent filtration of x-ray tube assemblies influences the x-ray dose. In particular the relationships of the X-ray prefiltrated at the minimal filtrations prescribed today are explained. Considerable variations from the correct dose for the standard filters are found especially at higher tube voltages.