High resolution gamma spectroscopy well logging system

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Description

A Gamma Spectroscopy Logging System (GSLS) has been developed to study sub-surface radionuclide contamination. The absolute counting efficiencies of the GSLS detectors were determined using cylindrical reference sources. More complex borehole geometries were modeled using commercially available shielding software and correction factors were developed based on relative gamma-ray fluence rates. Examination of varying porosity and moisture content showed that as porosity increases, and as the formation saturation ratio decreases, relative gamma-ray fluence rates increase linearly for all energies. Correction factors for iron and water cylindrical shields were found to agree well with correction factors determined during previous studies allowing for ... continued below

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17 p.

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Giles, J.R. & Dooley, K.J. May 1, 1997.

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Description

A Gamma Spectroscopy Logging System (GSLS) has been developed to study sub-surface radionuclide contamination. The absolute counting efficiencies of the GSLS detectors were determined using cylindrical reference sources. More complex borehole geometries were modeled using commercially available shielding software and correction factors were developed based on relative gamma-ray fluence rates. Examination of varying porosity and moisture content showed that as porosity increases, and as the formation saturation ratio decreases, relative gamma-ray fluence rates increase linearly for all energies. Correction factors for iron and water cylindrical shields were found to agree well with correction factors determined during previous studies allowing for the development of correction factors for type-304 stainless steel and low-carbon steel casings. Regression analyses of correction factor data produced equations for determining correction factors applicable to spectral gamma-ray well logs acquired under non-standard borehole conditions.

Physical Description

17 p.

Notes

INIS; OSTI as DE97052973

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  • 4. international conference on methods and applications of radioanalytical chemistry, Kona, HI (United States), 6-11 Apr 1997

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  • Other: DE97052973
  • Report No.: INEL/CON--97-00260
  • Report No.: CONF-970424--8
  • Grant Number: AC07-94ID13223
  • Office of Scientific & Technical Information Report Number: 484519
  • Archival Resource Key: ark:/67531/metadc684214

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  • May 1, 1997

Added to The UNT Digital Library

  • July 25, 2015, 2:21 a.m.

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  • June 13, 2016, 7:42 p.m.

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Giles, J.R. & Dooley, K.J. High resolution gamma spectroscopy well logging system, article, May 1, 1997; Idaho Falls, Idaho. (digital.library.unt.edu/ark:/67531/metadc684214/: accessed August 16, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.