Neutron radiographic detection limits of fluids in metal pipes

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Thermal neutron radiography has been used to image thin films of various fluids in thick-walled high-pressure process pipes. A 3.5 x 10$sup 6$ n/(cm$sup 2$-sec) thermal neutron beam and standard transfer imaging techniques were used to provide radiographs of the fluid-bearing pipes. In addition, a computer graphics procedure was developed which simulated the neutron radiographs; this method permitted examination of some fluid-pipe configurations not studied experimentally. Actual pipe outer dia ranged from $sup 1$/$sub 4$ to $sup 9$/ $sub 16$ in. (OD/ID = 3), but the graphics method was used for some cases outside this range. Fluids in the thermal ... continued below

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Pages: 29

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Winn, W.G. January 1, 1975.

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  • Savannah River Laboratory
    Publisher Info: Du Pont de Nemours (E.I.) and Co., Aiken, S.C. (USA). Savannah River Lab.
    Place of Publication: Aiken, South Carolina

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Description

Thermal neutron radiography has been used to image thin films of various fluids in thick-walled high-pressure process pipes. A 3.5 x 10$sup 6$ n/(cm$sup 2$-sec) thermal neutron beam and standard transfer imaging techniques were used to provide radiographs of the fluid-bearing pipes. In addition, a computer graphics procedure was developed which simulated the neutron radiographs; this method permitted examination of some fluid-pipe configurations not studied experimentally. Actual pipe outer dia ranged from $sup 1$/$sub 4$ to $sup 9$/ $sub 16$ in. (OD/ID = 3), but the graphics method was used for some cases outside this range. Fluids in the thermal cross section range 0.29 cm$sup -1$ less than or equal to $Sigma$/sub th//sup f/ less than or equal to 3.47 cm$sup - 1$ were examined for pipes with 0.099 cm$sup -1$ less than or equal to $Sigma$/ sub th//sup p/ less than or equal to 1.15 cm$sup -1$. For $Sigma$/sub th//sup f/ greater than $Sigma$/sub th//sup p/, the smallest measured film thickness t/sub s/ varied 0.006 to 0.040 in. with decreasing $Sigma$/sub th//sup f/; a semiempirical model described t/sub s/ = t/sub r/ + t/sub a/, where t/sub r/ corresponded to resolution and t/sub a/ depended on the bulk attenuation strength of the fluid. For $Sigma$/sub th//sup f/ less than $Sigma$/sub th//sup p/, part of the fluid film t/sub m/ was masked by the pipe. The calculated physical film thickness t/sub p/ = t/sub a/ + t/sub m/ ranged from 0.003 to 0.035 in. for smallest detected fluid films. Detection of low $Sigma$/sub th/ fluids was improved as much as 60 percent when the pipes were tilted 60$sup 0$ toward the neutron beam. Other options for improved detection were investigated using simulated radiographs. (auth)

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Pages: 29

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Dep. NTIS

Source

  • Conference of the American Society for Nondestructive Testing, Inc., Atlanta, Georgia, USA, 13 Oct 1975

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  • Report No.: DP-MS--75-86
  • Report No.: CONF-751016--4
  • Grant Number: AT(07-2)-1
  • Office of Scientific & Technical Information Report Number: 4154584
  • Archival Resource Key: ark:/67531/metadc872758

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Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

Office of Scientific and Technical Information (OSTI) is the Department of Energy (DOE) office that collects, preserves, and disseminates DOE-sponsored research and development (R&D) results that are the outcomes of R&D projects or other funded activities at DOE labs and facilities nationwide and grantees at universities and other institutions.

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  • January 1, 1975

Added to The UNT Digital Library

  • Sept. 16, 2016, 12:32 a.m.

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  • Feb. 17, 2017, 3:04 p.m.

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Winn, W.G. Neutron radiographic detection limits of fluids in metal pipes, article, January 1, 1975; Aiken, South Carolina. (digital.library.unt.edu/ark:/67531/metadc872758/: accessed April 25, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.