Neutron Radiography with SNRS

Alvar, K.R.; Cunningham, Robert K.; Polichar, R.; Smith, Douglas

doi:10.1007/978-1-4615-3742-7_122

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“…Note that this result is larger than the result derived from the thermal cross sections for the alloy elements (Ti 10.3 barns, Al 1.64 barns, V 9.88 barns) and 20.3 barns for unbound hydrogen. 19 Given the alloy density of 4.43 g/cm 3 , the alloy attenuation coefficient is 0.546 cm -1 . The attenuation coefficient for 100 ppm hydrogen is 0.0053 cm -1 .…”

Section: The Hydrogen Attenuation Coefficientmentioning

confidence: 99%

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Neutron tomography developments and applications

Richards¹,

Gibbons²,

Shields³

2004

Applied Radiation and Isotopes

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Neutron radiography has been in use as a nondestructive testing technique for the past fifty years. The neutrons' unique ability to image certain elements and isotopes that are either completely undetectable or poorly detected by other NDI methods makes neutron radiography an important tool for the NDI community. Neutron radiography like other imaging techniques takes a number of different forms (i.e., film, radioscopic, transfer methods, tomography, etc.) This paper will describe the neutron tomography system developed at the University of California, Davis McClellan Nuclear Radiation Center (UC Davis/MNRC), and the applications for both research and commercial uses.The neutron radiography system at the UC Davis/MNRC has been under development for four years. The initial system was developed to find very low concentrations of hydrogen (i.e., < 200 ppm). In order to achieve these low detection levels, it was necessary to perform both pre-and post-processing of the tomographs.The pre-processing steps include corrections for spatial resolution and random noise effects. Images are corrected for systematic noise errors and beam hardening. From these data the attenuation coefficient is calculated.The post-processing steps include alignment of the collected images, determining the center of mass, and, finally, using the filtered back-projection routine from the Donner Algorithms Library to obtain the final images.Since its initial development, the tomography system has been used very successfully to find low levels of hydrogen in a metal matrix. Further uses of the system have been to verify the exact placement, in three dimensions, of "O -rings" in large metal valve bodies, and to map the location and extent of veins in porous and high-density rocks of various different kinds.These examples show that neutron tomography is becoming a needed inspection technique for the 21 st century.

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Section: The Hydrogen Attenuation Coefficientmentioning

confidence: 99%

“…The University of California, Davis McClellan Nuclear Radiation Center (UCD/MNRC) 2,3 has several programs for the use of neutron tomography as a nondestructive inspection (NDI) technique. Among these is quantitative hydrogen concentration data for metal castings.…”

Section: Introductionmentioning

confidence: 99%