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DETECTION OF ThO$sub 2$ CONTAMINATION IN SIMULATED CUTS AND ABRASIONS

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Tests have been made to determine the sensitivity of various radiation detection instruments for known amounts of ThO/sub 2/ contained in simulated cuts and abrasions. A shielded Geiger-Mueller counter tube can be expected to detect at least 0.1 mg ThO/sub 2/ when counting for a reasonable length of time provided the ThO/sub 2/ deposit is on the surface of the subject being counted. A shielded gamma-spectrometer-crystal, set at a 50-kev cutoff, can be expected to detect at least 0.5 mg ThO/sub 2/ even when an absorber equivalent to 1/2 in. of paraffin is placed between the crystal and the ThO/sub ... continued below

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Pages: 24

Creation Information

Thomas, D.G. & Hilyer, J.V. January 15, 1959.

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Description

Tests have been made to determine the sensitivity of various radiation detection instruments for known amounts of ThO/sub 2/ contained in simulated cuts and abrasions. A shielded Geiger-Mueller counter tube can be expected to detect at least 0.1 mg ThO/sub 2/ when counting for a reasonable length of time provided the ThO/sub 2/ deposit is on the surface of the subject being counted. A shielded gamma-spectrometer-crystal, set at a 50-kev cutoff, can be expected to detect at least 0.5 mg ThO/sub 2/ even when an absorber equivalent to 1/2 in. of paraffin is placed between the crystal and the ThO/sub 2/ sample. Duration of exposure of standard film badge photographic emulsions is inversely proportional to the amount of material present and an exposure of about 300 hr is required to detect 10 mg of surface ThO/sub 2/. Although no information is available on the amount of thorium required to induce fibrosarcomas, an extrapolation of data for plutonium indicates that of the order of 1/2 gram of thorium must be present before occurrence of fibrosarcomas would be observed. This value does not represcnt a lower limit but is more likely to be a value for which occurrence of fibrosarcomas are a virtual certainty. It appears to be most desirable to experimentally determine the lower limit value for the amount of ThO/sub 2/ required to induce fibrosarcomas, noting that this may be as much as a factor of 100 smaller than the value cited above. (auth)

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Pages: 24

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  • Other Information: Orig. Receipt Date: 31-DEC-59

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  • Report No.: CF-59-1-35
  • Grant Number: W-7405-ENG-26
  • DOI: 10.2172/4246971 | External Link
  • Office of Scientific & Technical Information Report Number: 4246971
  • Archival Resource Key: ark:/67531/metadc1019144

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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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  • January 15, 1959

Added to The UNT Digital Library

  • Oct. 15, 2017, 10:09 p.m.

Description Last Updated

  • Oct. 23, 2017, 12:20 p.m.

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Thomas, D.G. & Hilyer, J.V. DETECTION OF ThO$sub 2$ CONTAMINATION IN SIMULATED CUTS AND ABRASIONS, report, January 15, 1959; Oak Ridge, Tennessee. (digital.library.unt.edu/ark:/67531/metadc1019144/: accessed January 23, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.