A penetrameter for measuring peak kilovoltage of dental X-ray sets

The Ardran and Crooks penetrameter in its original form is too large to be used satisfactorily for measuring peak kilovoltage of the small-diameter beams emitted by dental X-ray sets. The adaptation of a standard production dental occlusal cassette to be used as a penetrameter is described. This small penetrameter can be used with standard-size occlusal screen film to measure peak kilovoltage between 35 and 70 kVp, and the total filtration of the X-ray set.