Detection of ThO2 Contamination in Simulated Cuts and Abrasions

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Description

Tests have been made to determine the sensitivity of various radiation detection instruments for known amounts of ThO2 contained in simulated cuts and abrasions. A shielded Geiger Mueller counter tube can be expected to detect at least 0.1 mg ThO2 when counting for a reasonable length of time provided the ThO2 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 ThO2 even when an absorber equivalent to 1 2 in of paraffin is placed between the crystal and the ThO2 … continued below

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24 pages

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Thomas, D. G. January 15, 1959.

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Tests have been made to determine the sensitivity of various radiation detection instruments for known amounts of ThO2 contained in simulated cuts and abrasions. A shielded Geiger Mueller counter tube can be expected to detect at least 0.1 mg ThO2 when counting for a reasonable length of time provided the ThO2 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 ThO2 even when an absorber equivalent to 1 2 in of paraffin is placed between the crystal and the ThO2 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 ThO2. Although no information is available on the amount of thorium required to induce fibrosarcoma an extrapolation of data for plutonium indicates that of the order of 1/2 gram of thorium must be present before occurrence of fibrosarcoma would be observed. This value does not represent a lower limit but is more likely to be a value for which occurrence of fibrosarcoma are a virtual certainty. It appears to be most desirable to experimentally determine the lower limit value for the amount of ThO2 required to induce fibrosarcoma, noting that this may be as much as a factor of 100 smaller than the value cited above.

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24 pages

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Digitized from microopaque cards (1).

Includes bibliographic references (page 24).

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  • Report No.: CF-59-1-35
  • Grant Number: W-7405-eng-26
  • SuDoc Number: Y 3.At 7:22/CF-59-1-35
  • Accession or Local Control No: metadc1202987
  • Archival Resource Key: ark:/67531/metadc1202987

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  • January 15, 1959

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  • July 9, 2023, 5:35 p.m.

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  • Jan. 15, 2026, 11:29 a.m.

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Thomas, D. G. Detection of ThO2 Contamination in Simulated Cuts and Abrasions, report, January 15, 1959; Washington D.C.. (https://digital.library.unt.edu/ark:/67531/metadc1202987/: accessed February 15, 2026), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.

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