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10 Precision Gamma Scanner The PGS system consists of a collimator that penetrates the HFEF hot cell wall a high purity germanium HPGe gamma spectrometry system with Compton suppression and an incell stage used to position samples for examination in 4 degrees of freedom x y z rotation. The hot cell side of the collimator consists of tungsten alloy blocks that can be adjusted to create a slit height varying from 0.254 to 0.00254 cm 0.1 inches to 0.001 inches. The width of the collimator opening is fixed at 2.22 cm 0.875 inches creating a rectangular viewing area for the PGS system. Gammarays entering the collimator travel through a thin aluminum window pass through the initial tungsten collimator blocks through a second tungsten alloy beam scraper and then to the HPGe detector. The PGS collimator can be rotated from a horizontal slit orientation 90 degrees to a vertical slit orientation when needed for specific scanning procedures.