Nondestructive Assay of Decommissioned UF6 Cylinders Containing Residual Uranium


K. E. Meyer


In the course of historical UF6 operations at the East Tennessee Technology Park (ETTP) approximately 1000 UF6 cylinders have been decommissioned for eventual disposal. Such cylinders, having been emptied and rinsed, may still contain gram-quantities of low-enriched uranium and other radioactive contaminants. Canberra Oak Ridge LLC developed and utilized a Nondestructive Assay (NDA) methodology to quantify the residual radioisotopes to meet characterization requirements for disposition to Envirocare. This methodology involved (1) a scan of the exterior of the cylinder with a handheld NaI instrument to identify locations of gamma-emitting activity and (2) measurement of each end of the cylinder with a Canberra Broad Energy Germanium (BEGeĀ™) detector. The BEGe measurements were then analyzed utilizing Canberra Genie2K and In-Situ Object Counting System (ISOCS) mathematical calibration software. In this way the quantity of residual uranium and other radioisotopes in 377 30A (30-inch diameter) UF6 cylinders was determined over a three month period.


This abstract was presented at the 35th Annual Midyear Meeting, "Decommissioning and Environmental Restoration", Instrumentation Session, 2/17/2002 - 2/20/2002, held in Orlando, FL.

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