Development of a portable x-ray computed tomographic imaging system for drill-site investigation of recovered core

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A portable x-ray computed tomography (CT) system was constructed for imaging core at drill sites. Performing drill-site-based x-ray scanning and CT analysis permits rapid evaluation of core properties (such as density, lithologic structure, and macroporosity distribution) and allows for real-time decision making for additional core-handling procedures. Because of the speed with which scanning is performed, systematic imaging and electronic cataloging of all retrieved core is feasible. Innovations (such as a novel clamshell shielding arrangement integrated with system interlocks) permit safe operation of the x-ray system in a busy core handling area. The minimization of the volume encapsulated with shielding reduces ... continued below

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6 pages

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Freifeld, Barry M.; Kneafsey, Timothy J.; Tomutsa, Liviu & Pruess, Jacob May 2003.

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A portable x-ray computed tomography (CT) system was constructed for imaging core at drill sites. Performing drill-site-based x-ray scanning and CT analysis permits rapid evaluation of core properties (such as density, lithologic structure, and macroporosity distribution) and allows for real-time decision making for additional core-handling procedures. Because of the speed with which scanning is performed, systematic imaging and electronic cataloging of all retrieved core is feasible. Innovations (such as a novel clamshell shielding arrangement integrated with system interlocks) permit safe operation of the x-ray system in a busy core handling area. The minimization of the volume encapsulated with shielding reduces the overall system weight and facilitates instrument portability. The x-ray system as originally fabricated had a 110 kV x-ray source with a fixed 300-micron focal spot size. A 15 cm image intensifier with a cesium iodide phosphor input screen was coupled to a CCD for image capture. The CT system has since been modified with a 130 kV micro-focal x-ray source. With the x-ray system's variable focal spot size, high-resolution studies (10-micron resolution) can be performed on core plugs and coarser (100-micron resolution) images can be acquired of whole drill cores. The development of an aluminum compensator has significantly improved the dynamic range and accuracy of the system. An x-ray filter has also been incorporated, permitting rapid acquisition of multi-energy scans for more quantitative analysis of sample mineralogy. The x-ray CT system has operated reliably under extreme field conditions, which have varied from shipboard to arctic.

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6 pages

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OSTI as DE00816356

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  • 2003 International Symposium of the Society of Core Analysts, Pau (FR), 09/21/2003--09/24/2003

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  • Report No.: LBNL--52088-Ext.-Abs.
  • Grant Number: AC03-76SF00098
  • Office of Scientific & Technical Information Report Number: 816356
  • Archival Resource Key: ark:/67531/metadc736776

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Office of Scientific & Technical Information Technical Reports

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

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  • May 2003

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  • Oct. 18, 2015, 6:40 p.m.

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  • April 4, 2016, 12:39 p.m.

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Freifeld, Barry M.; Kneafsey, Timothy J.; Tomutsa, Liviu & Pruess, Jacob. Development of a portable x-ray computed tomographic imaging system for drill-site investigation of recovered core, article, May 2003; Berkeley, California. (digital.library.unt.edu/ark:/67531/metadc736776/: accessed December 18, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.