Atmospheric deposition, resuspension and root uptake of plutonium in corn and other grain-producing agroecosystems near a nuclear fuel facility Page: 4 of 51
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the surface of vegetation that enters the combine but is not transferred to grain is
assumed to be deposited on the soil with the refuse vegetation.
The model depicted in Figure I contains two simplifications of the model originally
presented in McLeod et al. (1980) and Adriano et al. (1982). The first simplification
involves a reduction in the number of parameters used to express resuspension to grain.
The original model contained two resuspension parameters associated with different
processes. Resuspension in the original model involved 1) resuspension of Pu-bearing soil
particles into the air during combining with subsequent intake into . the combine and
deposition onto grain and 2) the resuspension of Pu-bearing soil particles to vegetation
surfaces with subsequent transfer to grain surfaces during combining. .Although both of
these processes probably occur, the estimation of parameter values for these processes was
somewhat arbitrary because it was based on an assumption of equal transfer of Pu from
vegetation to grain surfaces in the combine for Pu from both deposition and resuspension
(i. e., equal Tvg). The current model does not separate these processes and uses a single
parameter, Rsg, to account for the total movement of Pu from soil to grains by both
processes.
Another simplification to the model originally presented by McLeod et al. (1980) and
Adriano et al. (1982) is the omission of Pu movement to grain via foliar absorption. This
process involves absorption at the leaf surface of atmosphc.ically-deposited substances
with subsequent translocation to grains and other plant tissues. Foliar :absorption has
been demonstrated for Pu (Cataldo et al. 1980). It was included in- the original model but
has been omitted here due to a lack Lr data comparing foliar absorption of Pu among
different plant species. The omissions of foliar uptake will be discussed in greater
detail in a later section.
Atmospheric deposition is expressed as Bq m2 d~l, and the soil inventory and
quantity of Pu harvest are expressed as Bq m-2. The soil inventory is assumed to be
uniformly mixed in the upper 0.15 m of soil by plowing, discing and other agricultural
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Pinder, J. E., III; McLeod, K. W.; Adriano, D. C.; Corey, J. C. & Boni, A. L. Atmospheric deposition, resuspension and root uptake of plutonium in corn and other grain-producing agroecosystems near a nuclear fuel facility, report, December 31, 1989; Aiken, South Carolina. (https://digital.library.unt.edu/ark:/67531/metadc1315839/m1/4/: accessed June 25, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.