This project took place in April 2009. Method Development for Characterization of Uranium in UF 6 Cylinders Scope: This project was to carry out a feasibility study and radiometric method development (with consideration of the physics methodology, measurement geometries and scanning methodology and identification of key indicator nuclides) for discrimination between standard storage cylinders containing UF 6 which is of virgin origin and that which has arisen from reprocessing operations. A High Resolution Gamma ray Spectrometry (HRGS) survey was conducted for 4 type 48Y UF 6 cylinders whose UF 6 inventory has already been sampled and chemically analyzed, in order to test the technique. Our standard In-Situ Object Counting System (ISOCSTM) which is an established flexible t

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