X-ray foreign body inspection works by imaging the differences in radiation absorption among materials. Foreign objects with higher density or larger atomic numbers, such as metal fragments, glass, stones, bone chips and hard plastics, show clear gray-level differences in the image and can be identified and rejected. Unlike metal detectors, which respond only to metal, X-ray systems cover both metallic and non-metallic contaminants and can also check internal structure, missing parts and package integrity, making them suitable for production lines with demanding foreign body control.
In the food industry, X-ray inspection is often used for meat products, seafood, bakery goods, nuts, sauces and prepared dishes to address risks such as bones, shells and plastic pieces. In pharmaceuticals, it is more often applied to tablets, capsules, blister packs and bottled products for foreign body and missing-unit checks. When purchasing, define inspection accuracy based on product form, packaging material, line speed and contaminant types, and also consider rejection method, radiation shielding structure, washdown protection level and interface compatibility with existing lines rather than judging by a single parameter.
Before selection, clarify your quality control objectives and acceptance criteria, and ask suppliers to provide test plans and sample validation for your actual products rather than generic specifications alone. In daily operation, establish sensitivity verification, radiation safety checks and record traceability, and pay attention to operator training and after-sales response. X-ray inspection is one link in a quality management system; proper selection combined with standardized use helps balance product safety and production efficiency.