The Mirion Standard Segmented Gamma Scanner (SGS system) is designed to perform accurate quantitative assays on gamma emitting nuclides found in fission products, activation products, and Transuranic (TRU) waste. With the optional ASTM algorithms it is also designed for use in safeguards applications. The system provides very accurate assays through the use of a collimated high purity germanium detector. The container is divided into a number of vertical segments and the activity is quantified in each vertical segment using matrix correction techniques based on attenuation corrections.

The system is designed to assay drums with volumes up to 200 L (55 gal) and weights up to 454 kg (1000 lb). The total system footprint is less than 4 m² (<36 square-feet) with a maximum height of 213.4 cm (84 in.) including lightpost; 157.5 cm (62 in.) to the top of the frame. Forklift pockets provide for easy transport within a facility.

The system is designed to assay radionuclides such as ⁶⁰Co or ¹³⁷Cs with drum activities ranging from approximately 100 nCi up to approximately 20 mCi. For transuranic waste the system is optimized for assaying drums containing 0.1 grams ²³⁵U or 0.2 grams ²³⁹Pu up to 1000 grams. There is some flexibility in the detector size and collimation that can be used to modify the dynamic range of the system.