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    Beam characterization at the neutron radiography reactor

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    Beam characterization at the ...
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    Author
    Morgan, Sarah
    Advisor
    King, Jeffrey C.
    Date issued
    2012
    Date submitted
    2012
    Keywords
    beam characterization
    radiography simulation
    NRAD
    neutron radiography
    characteristic curve
    Neutron radiography
    Beam dynamics
    Imaging systems in chemistry
    Idaho National Laboratory
    
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    URI
    https://hdl.handle.net/11124/76838
    Abstract
    The quality of a neutron imaging beam directly impacts the quality of radiographic images produced using that beam. Fully characterizing a neutron beam, including determination of the beam's effective length-to-diameter ratio, neutron flux profile, energy spectrum, image quality, and beam divergence, is vital for producing quality radiographic images. This thesis characterized the east neutron imaging beamline at the Idaho National Laboratory Neutron Radiography Reactor (NRAD). The experiments which measured the beam's effective length-to-diameter ratio and image quality are based on American Society for Testing and Materials (ASTM) standards. An analysis of the image produced by a calibrated phantom measured the beam divergence. The energy spectrum measurements consist of a series of foil irradiations using a selection of activation foils, compared to the results produced by a Monte Carlo n-Particle (MCNP) model of the beamline. Improvement of the existing NRAD MCNP beamline model includes validation of the model's energy spectrum and the development of enhanced image simulation methods. The image simulation methods predict the radiographic image of an object based on the foil reaction rate data obtained by placing a model of the object in front of the image plane in an MCNP beamline model.
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