Significance of environmental exposure pathways for technetium

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Numerical simulation techniques are used to produce a probable range of predicted values from estimates of uncertainty assigned to the parameters of radiological assessment models. This range is used to indicate the uncertainty in the model's prediction. The importance of individual parameters and exposure pathways is determined by their relative contribution to this simulated uncertainty index. The major pathways of exposure to humans resulting from the airborne emissions of /sup 99/Tc involve the consumption of vegetables, vegetable products, and poultry eggs. The most important model parameters are related to the mobility of /sup 99/Tc in soil, the incorporation of /sup ... continued below

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Pages: 31

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Hoffman, F.O.; Gardner, R.H. & Bartell, S.M. January 1, 1984.

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Description

Numerical simulation techniques are used to produce a probable range of predicted values from estimates of uncertainty assigned to the parameters of radiological assessment models. This range is used to indicate the uncertainty in the model's prediction. The importance of individual parameters and exposure pathways is determined by their relative contribution to this simulated uncertainty index. The major pathways of exposure to humans resulting from the airborne emissions of /sup 99/Tc involve the consumption of vegetables, vegetable products, and poultry eggs. The most important model parameters are related to the mobility of /sup 99/Tc in soil, the incorporation of /sup 99/Tc into the edible portions of crops, its transfer from vegetation to poultry eggs, and its atmospheric deposition. Uncertainty in the dose for individuals exposed to /sup 99/Tc-contaminated liquid discharges is dominated by the bioaccumulation of this isotope in aquatic food chains and by the possibility that contaminated surface water will be used as a source of drinking water. Results suggest that future reductions in the present estimates of uncertainty will lead to the dismissal of /sup 99/Tc as an environmentally important radionuclide, provided that de minimis dose levels are eventually adopted and releases of /sup 99/Tc from individual nuclear fuel cycle facilities will not be substantially larger than 1 Ci/year to the atmosphere and 100 Ci/year to the aquatic environment. These conclusions do not account for the possibility of a large long-term accumulation and remobilization of /sup 99/Tc in aquatic sediment and/or surface soils. 32 references, 9 tables.

Physical Description

Pages: 31

Notes

NTIS, PC A03/MF A01; 1.

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  • Scientific seminar on the behavior of technetium in the environment, Cadarache, France, 23 Oct 1984

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  • Other: DE85000266
  • Report No.: CONF-8410157-2
  • Grant Number: AC05-84OR21400
  • Office of Scientific & Technical Information Report Number: 6445869
  • Archival Resource Key: ark:/67531/metadc1207096

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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 1, 1984

Added to The UNT Digital Library

  • July 5, 2018, 11:11 p.m.

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  • Oct. 26, 2018, 1:07 p.m.

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Hoffman, F.O.; Gardner, R.H. & Bartell, S.M. Significance of environmental exposure pathways for technetium, article, January 1, 1984; United States. (digital.library.unt.edu/ark:/67531/metadc1207096/: accessed December 14, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.