The glove box is a type of enclosure used to completely contain Radioactive materials, thus separating them from the operator who needs to manipulate them. They are normally constructed from either a fibre glass material or stainless steel and incorporate extraction systems to maintain a negative pressure relative to the general working environment. They are particularly useful for Alpha emitting radioactive materials which can otherwise present a significant internal hazard if inhaled. If high energy Gamma emitters are also present the box may be shielded by lead sheet or bricks (with leaded glass viewing windows).