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首页> 外文期刊>Applied radiation and isotopes: including data, instrumentation and methods for use in agriculture, industry and medicine >A high-resolution abrasive method for determining diffusion profiles of sorbing radionuclides in dense argillaceous rocks
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A high-resolution abrasive method for determining diffusion profiles of sorbing radionuclides in dense argillaceous rocks

机译：测定高密度泥质岩中吸附放射性核素扩散曲线的高分辨率研磨方法

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The diffusion of (CS+)-C-134 and Na-22(+) in Opalinus Clay (OPA) was studied by in-diffusion laboratory experiments. The diffusive tracer profiles in the rock were determined using a high-resolution abrasive peeling method. The radionuclide activities in the grinding swarf were measured directly via gamma-spectrometry. By choosing the appropriate abrasive paper, a resolution down to 15 mu m can be achieved. This is important when analysing strongly sorbing radionuclides such as tri- and tetravalent actinides that show steep, shallow diffusion profiles. In this study, a resolution between 20 and 90 mu m was obtained which was sufficient for a good spatial resolution of the diffusion profiles.Both the effective diffusion coefficients and the distribution coefficients of the radionuclides could be determined by applying a single reservoir with decreasing source concentration analysis for a semi-infinite case. In the case of 22Na+, effective diffusion coefficients of D-e = 2.0 x 10(-11) m(2) s(-1) and D-e = 1.5 x 10(-11) m(2) s(-1) for Benken (Zurcher Weinland) OPA and Mont Terri OPA, respectively, were derived. The distribution coefficients were K-d = 3.1 x 10(-4) and 0.9 x 10(-4) m(3) kg(-1), respectively. For (CS+)-C-134 the effective diffusion coefficients were higher, i.e. D-e = 3.1 x 10(-11) m(2) s(-1) for OPA from Benken and D-e = 3.0 x 10(-11) m(2) s(-1) for OPA from Mont Terri. The distribution coefficients determined were K-d = 0.16 m(3) kg(-1) for Benken and 0.23 m(3) kg(-1) for Mont Terri. Comparison of the data obtained for the weakly sorbing Na-22(+) with those from earlier through-diffusion experiments showed that there is good agreement between the two methods. In the case Of (CS+)-C-134 such a comparison was not possible because through-diffusion data are not available.Because through-diffusion methods cannot be applied to strongly sorbing tracers in reasonable time periods, in-diffusion combined with high-resolution abrasive peeling offers an excellent alternative for measuring the diffusion properties of strongly sorbing tracers in dense argillaceous rocks. (c) 2005 Elsevier Ltd. All rights reserved.
机译：通过扩散实验室实验研究了（CS +）-C-134和Na-22（+）在蛋白石粘土（OPA）中的扩散。岩石中的扩散示踪剂剖面是使用高分辨率磨削剥离法确定的。磨屑中的放射性核素活性直接通过伽马能谱法测量。通过选择合适的砂纸，可以实现低至15微米的分辨率。当分析显示陡峭，浅扩散曲线的强吸附放射性核素（例如三价和四价act系元素）时，这一点很重要。在这项研究中，获得了20至90μm的分辨率，这足以使扩散剖面具有良好的空间分辨率。可以通过使用单个递减储层的储层来确定放射性核素的有效扩散系数和分布系数。半无限情况下的集中度分析。在22Na +的情况下，对于Benken，有效扩散系数De = 2.0 x 10（-11）m（2）s（-1）和De = 1.5 x 10（-11）m（2）s（-1）（分别推导了Zurcher Weinland（OP）和Mont Terri（OP）。分布系数分别为K-d = 3.1 x 10（-4）和0.9 x 10（-4）m（3）kg（-1）。对于（CS +）-C-134，有效扩散系数更高，即来自Benken的OPA的De = 3.1 x 10（-11）m（2）s（-1），De = 3.0 x 10（-11）m（ 2）s（-1）用于来自Mont Terri的OPA。确定的分布系数对于Benken是K-d = 0.16 m（3）kg（-1），对于Mont Terri是0.23 m（3）kg（-1）。将较弱吸附的Na-22（+）与较早的通过扩散实验获得的数据进行比较，结果表明两种方法之间具有很好的一致性。对于（CS +）-C-134，由于无法获得穿透数据，因此无法进行比较。由于无法在合理的时间段内将穿透方法应用于强吸收示踪剂，因此，结合使用高扩散高分辨率磨料剥离法是测量强吸附示踪剂在致密泥质岩中扩散特性的极佳选择。 （c）2005 Elsevier Ltd.保留所有权利。

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