United States Nuclear Regulatory Commission - Protecting People and the Environment

Literature Review and Assessment of Plant and Animal Transfer Factors Used in Performance Assessment Modeling (NUREG/CR-6825, PNNL-14321)

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Publication Information

Manuscript Completed: June 2003
Date Published: August 2003

Prepared by:
D.E. Robertson, D.A. Cataldo, B.A. Napier, K.M. Krupka, L.B. Sasser
Pacific Northwest National Laboratory
P.O. Box 999
Richland, Washington 99352

P.R. Reed, NRC Project Manager

Prepared for:
Division of Systems Analysis and Regulatory Effectiveness
Office of Nuclear Regulatory Research
U.S. Nuclear Regulatory Commission
Washington, DC 20555-0001

NRC Job Code Y6469

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Abstract

A literature review and assessment was conducted by Pacific Northwest National Laboratory (PNNL) to update information on plant and animal radionuclide transfer factors used in performance-assessment modeling. A group of 15 radionuclides was included in this review and assessment. The review is composed of four main sections, not including the Introduction. Section 2.0 provides a review of the critically important issue of physicochemical speciation and geochemistry of the radionuclides in natural soil-water systems as it relates to the bioavailability of the radionuclides. Section 3.0 provides an updated review of the parameters of importance in the uptake of radionuclides by plants, including root uptake via the soil-groundwater system and foliar uptake due to overhead irrigation. Section 3.0 also provides a compilation of concentration ratios (CRs) for soil-to-plant uptake for the 15 selected radionuclides. Section 4.0 provides an updated review on radionuclide uptake data for animal products related to absorption, homeostatic control, approach to equilibration, chemical and physical form, diet, and age. Compiled transfer coefficients are provided for cows milk, sheeps milk, goats milk, beef, goat meat, pork, poultry, and eggs. Section 5.0 discusses the use of transfer coefficients in soil, plant, and animal modeling using regulatory models for evaluating radioactive waste disposal or decommissioned sites. Each section makes specific suggestions for future research in its area.

A compact disk (CD) is supplied with this report. The CD contains an electronic copy of this report in portable document format (PDF). The figures in this report have been printed in black and white; color versions of the figures are provided on the CD.

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