Abstract：
:In most studies quantifying the migration parameters - apparent migration velocity and apparent dispersion coefficient - of radionuclides in the soil by model calculations, these parameters are determined for undisturbed soils. For soils disturbed by ploughing, however, no such data are available in the literature. Therefore, in the present study, the migration parameters of (137)Cs, (60)Co and (226)Ra were estimated for ploughed soils by means of a convection-dispersion model. The depth distributions of the radionuclides were determined in four lysimeters (area: 1m(2), depth of soil monolith: 0.75m) filled with artificially contaminated soils of different types in July 1990. The lysimeters were cropped with agricultural plants. The soil in each lysimeter was ploughed manually once a year until 1996 (plough depth 20cm). In July 1999, soil samples were collected from three pits in each lysimeter. The depth distributions of all radionuclides proved to be very similar in each soil pit. The spatial variability of the depth distributions of a given radionuclide within the lysimeters was about the same as their variability between the four lysimeters. Evaluation of the migration parameters revealed that the convective transport of the radionuclides was always rather small or even zero, while the dispersive transport caused a "melting" process of the initially sharp activity edge at the lower border of the Ap horizon. These results are explained by the high evapotranspiration (80-90% of the total precipitation plus irrigation) and the small amounts of seepage water during the observation period of 9 years.
journal_name
J Environ Radioactjournal_title
Journal of environmental radioactivityauthors
Shinonaga T,Schimmack W,Gerzabek MHdoi
10.1016/j.jenvrad.2004.05.018subject
Has Abstractpub_date
2005-01-01 00:00:00pages
93-106issue
2eissn
0265-931Xissn
1879-1700pii
S0265-931X(04)00201-2journal_volume
79pub_type
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journal_title：Journal of environmental radioactivity
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journal_title：Journal of environmental radioactivity
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journal_title：Journal of environmental radioactivity
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journal_title：Journal of environmental radioactivity
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journal_title：Journal of environmental radioactivity
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journal_title：Journal of environmental radioactivity
pub_type： 杂志文章
doi：10.1016/j.jenvrad.2007.03.003
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journal_title：Journal of environmental radioactivity
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journal_title：Journal of environmental radioactivity
pub_type： 杂志文章
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journal_title：Journal of environmental radioactivity
pub_type： 杂志文章
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更新日期：2008-02-01 00:00:00
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journal_title：Journal of environmental radioactivity
pub_type： 杂志文章
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更新日期：2005-01-01 00:00:00
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journal_title：Journal of environmental radioactivity
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journal_title：Journal of environmental radioactivity
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journal_title：Journal of environmental radioactivity
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journal_title：Journal of environmental radioactivity
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journal_title：Journal of environmental radioactivity
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journal_title：Journal of environmental radioactivity
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更新日期：2001-01-01 00:00:00
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journal_title：Journal of environmental radioactivity
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更新日期：2004-01-01 00:00:00
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journal_title：Journal of environmental radioactivity
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journal_title：Journal of environmental radioactivity
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