Sentinel Model 880 Delta and 880 Elite source projectors are portable, lightweight and compact industrial radiographic exposure devices. The exposure device body consists of a titanium 'S' tube and cast depleted Uranium (DU) shield contained within a 300 series stainless steel tube with stainless steel discs welded at each end forming a cylinder shaped housing. The discs are recessed to provide protection for the rear mounted locking mechanism and front mounted outlet port.

The horizontally oriented design allows the locking mechanism, source assembly connector and outlet port to be easily operated, simplifying connection of source guide tubes and projection sheaths.
The internal void space of the housing is filled with polyurethane foam to prevent the ingress of water or foreign material but is open to atmospheric pressure.

The exposure device body, containing the DU shield, locking mechanism, outlet port, protective covers and required labels, comprises the radioactive material transport Type B package.