X-ray foreign body inspection works by imaging differences in radiation absorption. Denser or higher-atomic-number contaminants such as metal fragments, glass, stones, hard plastics and bone chips appear at different gray levels from the food or drug matrix and can be identified and rejected. Compared with metal detectors, X-ray systems cover not only metals but also non-metallic hard contaminants, and can simultaneously check internal structure, missing parts and fill-level anomalies, making them suitable for processes with tighter foreign body control.
In food production, X-ray inspection is common in meat, seafood, bakery, nuts, sauces and packaged foods, and handles cases where metal detectors struggle, such as aluminium foil packaging and metal trays. In pharmaceuticals, its value lies in foreign body screening and integrity checks for tablets, capsules, blister packs and bottled products. Detection performance depends on product density, thickness, packaging material and contaminant size; thin or density-matched contaminants are harder to detect, so real product testing before purchase is advisable.
When selecting a system, focus on the balance between detection sensitivity and product effect, conveyor speed versus line takt, reliability of the rejection method, and ease of cleaning and data traceability. Protection rating, radiation safety interlocks, routine calibration and maintenance cost should also be assessed. Ask suppliers for test reports based on your own products, and specify acceptance criteria and after-sales response in the contract rather than deciding from datasheets alone.