Retardation Factor of a Radionuclide for Undisturbed and Disturbed Sandy Soil

In an aerated soil layer under natural condition, water that infiltrates into it flows discontinuously because of repeated cycles of rainfall and drying. Therefore, column tests, in which 2,000 ml of deionized water was fed into sandy soil layer dried for 3-90 days after it is contaminated by 6°C o, 85 Sr and 137 Cs aqueous solution, were carried out to examine influence of the drying period on migration behavior of those nuclides.All the radionuclides showed both a steeply decreasing part corresponding to their cationic form and a gradually decreasing part corresponding to their particulate form in the concentration distribution curve along the soil column depth. In the vicinity of the top surface of soil layer, no influence of drying on 6°C o and 137 Cs concentrations was observed, but 85 Sr moved a little into a deeper part from the top surface with longer drying period. Such moving tendency of 85 Sr was found to be connected with the Ca•+ concentration in the interstitial water. In the deeper soil layer, no influence of drying on 85 Sr concentration was observed, but the 6°C o and 137 Cs concentrations were increased with the drying period. This is considered to be caused from that each product of the movable 6°C o(OH). and the 137 Cs adsorbed on the fine particle increased with the rise of pH and the fine particle concentration, respectively, during the drying period. Thus, this study has suggested possible causes affecting on the radionuclide migration under discontinuous flow condition.

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Migration of¹³⁷Cs Extracted from Contaminated Tea in Sandy Clay Soil

Yücel

Özmen

1995

Journal of Nuclear Science and Technology

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The migration behavior of I3'Cs extracted from the contaminated tea a t Chernobyl accident in sandy clay soil has been studied by batch and column experiments. Time dependent sorption behavior of 13;Cs extracted from the tea reaches equilibrium slower by 6.5 times than 13'Cst ions. However, the distribution coefficient of ' T s extracted from the tea for the sandy clay soil was higher than that of lJiCs+ ions. These results indicate that the sorption of the I3'Cs attached to the organic materials dissolved from the tea on the sandy clay soil is slower than that of 13'Csf ions, and the I 3 T s attached to the organic materials have more affinity to the sandy clay soil than 13'Cs+ ions. In the column experiments, most part of W s were adsorbed on the top of soil layer 0-10 cm in depth and small amounts of 13'Cs were flowed out from the soil layer. The concentration profile a t the top of soil layer of 0-lOcm is in agreement with that estimated by the dispersiontransport equation considered ion-exchange reaction indicating that the migration of lS7cS extracted from the contaminated tea a t the portion of high concentration is dominated by ionexchange reaction. However, the concentration profile a t deeper depth than lOcm is not fitted by estimation by such equation. Therefore, the mechanism other than ion-exchange dominates the migration of I3'Cs in the portion of low concentration.

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Retardation Factor of a Radionuclide for Undisturbed and Disturbed Sandy Soil

Cited by 5 publications

References 11 publications

Determination of distribution coefficient of 137Cs and 90Sr in soil from AERE, Savar

Determination of distribution coefficient of 137Cs and 90Sr in soil from AERE, Savar

Influence of Drying Period on Migration Behavior of Radionuclides in Aerated Soil Layer

Migration of¹³⁷Cs Extracted from Contaminated Tea in Sandy Clay Soil

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Retardation Factor of a Radionuclide for Undisturbed and Disturbed Sandy Soil

Cited by 5 publications

References 11 publications

Determination of distribution coefficient of 137Cs and 90Sr in soil from AERE, Savar

Determination of distribution coefficient of 137Cs and 90Sr in soil from AERE, Savar

Influence of Drying Period on Migration Behavior of Radionuclides in Aerated Soil Layer

Migration of137Cs Extracted from Contaminated Tea in Sandy Clay Soil

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Migration of¹³⁷Cs Extracted from Contaminated Tea in Sandy Clay Soil