It is not possible in some sectors to work with metal detectors. For example, this is the case where products are packed in aluminium packaging. The solution here is to use an x-ray detector. Foreign objects can be detected by this system where their density is greater than that of the product, including its packaging.
The Detectaplast ® X Ray plasters contain a thread of barium sulphate that is detectable by an X-Ray detector and can be removed immediately from the food chain. Barium sulphate is regularly used in healthcare as a contrast when making x-ray images.