[Simplified determination of the effective prefiltration of an X-ray tube].

For determining the effective prefiltration of an x-ray tube assembly only a very expensive method was known up to now that is not suitable for a general use. Therefore, no reliable data for prefiltration could be stated in individual cases. The present article describes a method useful for determination of the prefiltration. With this method reliable statements on the radiation exposure of the patient are possible in every case.