Shielded tool monitors used to clear potentially radioactive material for free release.  The industry standard device for clearing small equipment from radiological areas.  These are the two door variety whereby you could place it at the boundary of a controlled area and pass items through to cleared areas.

Great for quantifying radioactive materials. 

2″ of lead shielding with plastic scintillator detectors in an array around the box.

4 plastic scintillator detectors

Measuring Volume Dimensions:

Height 15″

Width 15″

Depth:  21″

Total volume 2.6 cubic ft (74 L).

Carts may also be available.  Please enquire.