Rapid detailed characterization of concrete shielding blocks utilizing internal natural radionuclides for calibration

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Following many years of productive work, the SuperHILAC and Bevalac accelerators at Lawrence Berkeley National Laboratory were closed, leaving thousands of concrete shielding blocks available for reuse or disposal. The process history of these blocks as shielding precludes free release pending radiological characterization. This paper presents a method for the rapid characterization of gamma-ray-emitting radioisotopes in large samples of earth-like materials: concrete shielding blocks in this case. Active regions are identified with a sensitive radiation-survey instrument and then examined in detail with a high-efficiency lead-shielded Ge spectrometer. Naturally-occurring gamma-ray emissions from the decays of uranium, thorium, and potassium are used ... continued below

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9 p.

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McDonald, R.J.; Smith, A.R.; Norman, E.B. & Cowles, D. October 1, 1995.

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Description

Following many years of productive work, the SuperHILAC and Bevalac accelerators at Lawrence Berkeley National Laboratory were closed, leaving thousands of concrete shielding blocks available for reuse or disposal. The process history of these blocks as shielding precludes free release pending radiological characterization. This paper presents a method for the rapid characterization of gamma-ray-emitting radioisotopes in large samples of earth-like materials: concrete shielding blocks in this case. Active regions are identified with a sensitive radiation-survey instrument and then examined in detail with a high-efficiency lead-shielded Ge spectrometer. Naturally-occurring gamma-ray emissions from the decays of uranium, thorium, and potassium are used to calibrate the spectrometer. A simple relationship exists between the observed counting rate in a characteristic gamma ray and the activity in the block. This method, taking only tens of minutes per sample at the nano-Curie/gram sensitivity level, replaces much of the expensive coring and laboratory analysis methods needed otherwise.

Physical Description

9 p.

Notes

INIS; OSTI as DE96008565

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  • Waste management `96: HLW, LLW, mixed wastes and environmental restoration - working towards a cleaner environment, Tucson, AZ (United States), 25-29 Feb 1996

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  • Other: DE96008565
  • Report No.: LBL--38229
  • Report No.: CONF-960212--73
  • Grant Number: AC03-76SF00098
  • Office of Scientific & Technical Information Report Number: 219354
  • Archival Resource Key: ark:/67531/metadc664507

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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.

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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  • October 1, 1995

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  • June 29, 2015, 9:42 p.m.

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  • April 5, 2016, 12:06 p.m.

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McDonald, R.J.; Smith, A.R.; Norman, E.B. & Cowles, D. Rapid detailed characterization of concrete shielding blocks utilizing internal natural radionuclides for calibration, article, October 1, 1995; California. (digital.library.unt.edu/ark:/67531/metadc664507/: accessed October 18, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.