[Control of exposure times of dental X-ray units]

The presented X-ray gyroscope enables any member of the dental staff authorized to take radiograms to check the exposure time of the X-ray examination unit for its accuracy in a simple manner. Any load half-wave interval is displayed by a density point on an ORWO XR 5 3/4 X 7 1/2 radiographic film by utilizing the regularity of the emission ratio of one-pulse X-ray generators. A density point corresponds to 0.02 second. This method has been used to check and evaluate timers on 10 X-ray examination units of various models. The "Stomax 100" timers showed the least deviations to the exposure time required.