Abstract: The density of an X-ray exposure depends not only on the exposure parameters, but also on the film development parameters. In order to eliminate the effect of fluctuations in the latter parameters, the X-ray generator in accordance with the invention comprises a measuring device which measures the density of a test exposure and which acts on an adjusting member for the exposure parameters. By subjecting the test exposure to the same conditions as the X-ray exposure, the effects of parameter fluctuations during film processing process can be eliminated to a high degree.

Abstract: An arrangement for detecting foreign objects in products. The products are X-rayed to produce a quantized raster scanned signal. The samples thus obtained for each line are combined with the bit samples of the next line, shifted by at least one position, and the output signal is applied to an evaluation arrangement which supplies an alarm signal when a foreign object is present.