Preprocessing of backprojection images in the McClellan Nuclear Radiation Center tomography system

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Description

Neutron tomography is being investigated as a nondestructive technique for quantitative assessment of low atomic mass impurity concentration in metals. Neutrons maximize the sensitivity given their higher cross sections for low Z isotopes while tomography provides the three dimensional density information. The specific application is the detection of Hydrogen down to 200 ppm weight in aircraft engine compressor blades. A number of preprocessing corrections have been implemented for the backprojection images in order to achieve the detection requirements for a testing rate of three blades per hour. Among the procedures are corrections for neutron scattering and beam hardening. With these ... continued below

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52 pages

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Gibbons, M. R., LLNL February 19, 1998.

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Description

Neutron tomography is being investigated as a nondestructive technique for quantitative assessment of low atomic mass impurity concentration in metals. Neutrons maximize the sensitivity given their higher cross sections for low Z isotopes while tomography provides the three dimensional density information. The specific application is the detection of Hydrogen down to 200 ppm weight in aircraft engine compressor blades. A number of preprocessing corrections have been implemented for the backprojection images in order to achieve the detection requirements for a testing rate of three blades per hour. Among the procedures are corrections for neutron scattering and beam hardening. With these procedures the artifacts in tomographic reconstructions are shown to be less than the signal for 100 ppm hydrogen in titanium alloy samples.

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52 pages

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OSTI as DE00016726

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  • Other Information: Supercedes report DE98057894; PBD: 19 Feb 1998

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  • Other: DE98057894
  • Report No.: UCRL-ID--129965
  • Grant Number: W-7405-Eng-48
  • DOI: 10.2172/16726 | External Link
  • Office of Scientific & Technical Information Report Number: 16726
  • Archival Resource Key: ark:/67531/metadc626152

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  • February 19, 1998

Added to The UNT Digital Library

  • June 16, 2015, 7:43 a.m.

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  • May 6, 2016, 2:54 p.m.

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Gibbons, M. R., LLNL. Preprocessing of backprojection images in the McClellan Nuclear Radiation Center tomography system, report, February 19, 1998; Livermore, California. (digital.library.unt.edu/ark:/67531/metadc626152/: accessed November 16, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.