Waste Inspection Tomography for Non-Destructive Evaluation (WITNDA)

A gamma ray Computed Tomography (CT) system developed indigenously for doing feasibility studies on tomographic waste assay and for validating the transmission and emission tomography algorithms. Automation of the data collection has been achieved by integrating four axes Galil based drum rotating driver and HPGe gamma spectroscopy software using windows based Visual Basic (VB) program. Attenuation tomograms using Filter Back Projection (FBP) and Algebraic Reconstruction Technique (ART) and emission tomograms using Maximum Likelihood Expectation Maximization (MLEM) techniques developed and validated. The transmission tomograms of a MS test object of 165 mm OD cylindrical container with MS rods and filled with sand and emission tomograms of a 4.7 mCi 137Cs source embedded in the test object and its activity quantified. (author)