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in creator/contributor: "Weirup, D L"  
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Preprocessing of ion microtomography data for improved reconstruction quality

Description: In Ion Microtomography (IMT), material densities are determined from the energy lost by ions as they pass through a specimen. For fine-scale measurements with micron-size beams, mechanical stability and precision of motion can impact the quality of the reconstruction. We describe several preprocessing procedures used to minimize imperfect specimen manipulation, including adjustment of the center of mass motion in sinograms and correction for vertical translations. In addition, the amount of noi… more
Date: November 29, 1990
Creator: Weirup, D. L.; Pontau, A. E.; Antolak, Arlyn J.; Morse, Dan H.; Bench, G.; Cholewa, M. et al.
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Partner: UNT Libraries Government Documents Department
open access

The "Nuclear Car Wash": A Scanner to Detect Illicit Special Nuclear Material in Cargo Containers

Description: There is an urgent need to improve the reliability of screening cargo containers for illicit nuclear material that may be hidden there for terrorist purposes. A screening system is described for detection of fissionable material hidden in maritime cargo containers. The system makes use of a low intensity neutron beam for producing fission; and the detection of the abundant high-energy {gamma} rays emitted in the {beta}-decay of short-lived fission products and {beta}-delayed neutrons. The abund… more
Date: January 28, 2004
Creator: Slaughter, D. R.; Accatino, M. R.; Bernstein, A.; Dougan, A. D.; Hall, J. M.; Loshak, A. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Characterization of low density carbon foams by x-ray computed tomography (CT) and ion microtomography (IMT)

Description: Two NDT techniques were used to characterize low-density, microcellular, carbon foams fabricated from a salt replica process. The two techniques are x-ray computed tomography (CT) and ion microtomography (IMT); data are presented on carbon foams that contain high-density regions. The data show that densities which differ by <10% are easily observable for these low density (<100 mg/cm{sup 3}) materials. The data reveal that the carbon foams produced by this replica process have small density var… more
Date: January 1, 1990
Creator: Moddeman, W. E.; Kramer, D. P.; Firisch, D. W.; Trainer, P. D.; Yancy, R. N.; Weirup, D. L. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Early Results Utilizing High-Energy Fission Product (Gamma) Rays to Detect Fissionable Material in Cargo

Description: A concept for detecting the presence of special nuclear material ({sup 235}U or {sup 239}Pu) concealed in intermodal cargo containers is described. It is based on interrogation with a pulsed beam of 7 MeV neutrons that produce fission events and their {beta}-delayed neutron emission or {beta}-delayed high-energy {gamma}-radiation between beam pulses provide the detection signature. Fission product {beta}-delayed {gamma}-rays above 3 MeV are nearly ten times more abundant than {beta}-delayed neu… more
Date: September 30, 2004
Creator: Slaughter, D. R.; Accatino, M. R.; Bernstein, A.; Church, J. A.; Descalle, M. A.; Gosnell, T. B. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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