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- W2022254003 abstract "The University of Virginia’s real-time neutron radiography facility was characterized by measurement of the total neutron flux, gold/cadmium ratio, neutron/gamma ratio, and the effective collimator length-to-aperture diameter (L/D) ratio. The real-time neutron imaging system and collimator were further characterized by measuring the modulation transfer function (MTF) of the system. The collimator effectiveness was measured by using the MTF to determine the “unparallelism” of the neutron beam. The MTF was also used to determine the effects of any reactor or beamport changes and to examine the effect of various system components on image quality. The computer-based image processing system allowed rapid calculation of the MTF and the collimator effectiveness. The results of these measurements, using no collimator and a simple tube collimator, demonstrated the method’s ability to determine the effective L/D ratio. The MTF measurement scheme provided a fast, reliable, and reproducible means of monitoring any changes in the real-time system, including both the neutron beam and the electronic components. The MTFs for various system components were measured using a separation technique. A parameter fN was used to give a quantitative measure of an individual system component’s performance." @default.
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- W2022254003 date "1988-09-01" @default.
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- W2022254003 title "Real-Time Neutron Radiography System Performance—Measurements and Methods" @default.
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- W2022254003 doi "https://doi.org/10.13182/nt88-a34136" @default.
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