RAYCON D product inspection systems detect all contaminants that due to their density, chemical composition, or mechanical dimensions absorb X-radiation to a lesser or greater degree than the surrounding product. For example, metal, glass, ceramics, and stone contaminants in food. RAYCON D will also detect some plastics (e.g. PVC, rubber) as well as other product defects (e.g. cracks, trapped air). Desired "contaminants" (e.g. aluminium clips on sausage chubs) can be masked out.