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An incident with a high-voltage generator more than 25 years old was the occasion for a discussion of the safety of such generators. A control timer broke down during the exposure period, and before the radiographer was able to react the X-ray tube imploded. The young patient suffered increased exposure and partial grade 3 burns. If such a breakdown occurs during exposure the radiographer has to turn off the generator by hand. This is the only way of preventing injury to the patient. Owners of such units must be aware of their particular responsibility and should train their personnel accordingly. In case of a breakdown only well-trained staff can act immediately, in the knowledge that only a few seconds are available before the patient suffers physical injuries. The fault mentioned should have been expected and it could happen again any time with such an old installation.

Microfilming of X-ray films has become more topical owing to the amendment of the X-ray regulations. The storage of X-rays as reproductions on an image or data carrier is expressly envisaged as a possibility in the text of the regulation. The quality of transfer must be insured and the copies must be legible. In microfilming, the latitude and the resolution capacity of the microfilm and remagnification are appropriate as parameters of image quality. Testing of seven filming systems shows a major range of variation of both parameters; in some cases, the results led to reexamination of the camera adjustment and developer chemistry. A test of constancy of filming analogous to direct radiography appears necessary. A corresponding norm does not exist at present.