Robert Estep

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Protection of large and complex urban areas from radiological threats may be improved by employing a network of distributed radiation detectors. Among the many considerations involved in designing such a system are detector type, concept of operations, methods to collect and extract meaningful information from multiple data sources, and cost. We have(More)
Tomographic gamma scanning of waste produces three-dimensional transmission and emission images. These are used to derive item-specific attenuation correction factors that improve the accuracy of non-destructive waste assay. For each vertical layer, data grabs of short duration are acquired as the waste item is rotated and translated. The image(More)
This application guide was created to provide the user of the Tomographic Gamma Scanning (TGS) technology with a single comprehensive reference to the developmental aspects, underlying principles, and performance characteristics of modern TGS systems. The Department of Energy, National Nuclear Security Administration, Office of Policy Integration and(More)
The multiple isotope material basis set (MIMBS) method for isotope identification combines the material basis set (MBS) model of gamma spectrum attenuation with ordinary response function fitting to identify shielded gamma-emitting isotopes, using low and medium resolution gamma detectors such as NaI(Tl) and LaBr<inf>3</inf>. We recently improved the MIMBS(More)
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