By means of the annular collimator camera, we newly proposed an inspection technique to identify the source origins of leaked X-rays. In order to demonstrate the availability of our technique, an experiment using the test model of an X-ray inspection apparatus was presented. In this experiment, a leak point at the collimator of an incident X-ray could be identified. Because this leak point was located in the inside of the equipment, it was difficult to apply a conventional testing method using handy-type radiation detectors. We concluded that our method was valuable for implementers to create safer inspection systems.
