The neutron and gamma attribute tester (NGAT) is a compact, universal instrument used for underwater verification of spent fuel assemblies, fresh MOX fuel assemblies, and open or closed containers holding various irradiated and non-irradiated materials including non-fuel items. The equipment's compact and lightweight design permits the user to easily handle it from the spent fuel pond bridge. The NGAT performs both neutron and γ measurements for gross defect verification. The instrument can be equipped with either a fission chamber or a 10B detector for neutron counting, as well as with a collimated and shielded CdZnTe detector for γ spectroscopy.

(Source: IAEA Safeguards Techniques and Equipment)