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Assessment of Leaching Characteristics for Cerium and Cesium as Surrogates for Radioactive Materials
Nuclear Technology ( IF 1.5 ) Pub Date : 2020-04-01 , DOI: 10.1080/00295450.2020.1730672
Riyadh M. Motny 1 , Michael E. Woods 1 , Supathorn Phongikaroon 1
Affiliation  

Abstract The leaching behavior of cerium and cesium from different mixtures of rapid setting cement (RSC) with deionized water (DIW) and artificial seawater (ASW) under both dynamic and static leach conditions was investigated according to the method in American National Standard ANSI/ANS-16.1-2003. The leachate solution was collected, diluted with HNO3, and analyzed using inductively coupled plasma–mass spectrometry after leaching periods of 2, 7, and 24 h and 2, 3, 4, 5, 14, 28, 43, and 90 days. Two models [the first-order reaction model (FRM) and the diffusion model (DM)] and their combination [the first-order reaction/diffusion model (FRDM)] were fitted to assess the leaching parameters and identify the type of immobilized radionuclides in the RSC matrix. The result indicated that leaching of 140Ce and 133Cs from the RSC matrices with DIW and ASW under both dynamic and static leach conditions was less than 20% and suggested that the leaching behavior of 140Ce and 133Cs approximated that of a semi-infinite medium. The leaching phenomena of 140Ce and 133Cs could not be fully represented with a single model (the FRM and the DM), and the FRDM was best fitted to these experimental data sets. Overall, the average leachability index L values for 140Ce and 133Cs were greater than the minimum limit indicating their acceptance for disposal recommended by the International Atomic Energy Agency. It could also be stated that RSC with DIW or ASW had a potential for immobilizing radioactive materials.

中文翻译:

评价作为放射性材料替代物的铈和铯的浸出特性

摘要 根据美国国家标准 ANSI/ANS 中的方法,研究了快凝水泥 (RSC) 与去离子水 (DIW) 和人工海水 (ASW) 的不同混合物在动态和静态浸出条件下铈和铯的浸出行为。 -16.1-2003。收集浸出液,用 HNO3 稀释,并在浸出 2、7 和 24 小时和 2、3、4、5、14、28、43 和 90 天后使用电感耦合等离子体质谱法进行分析。拟合了两个模型 [一级反应模型 (FRM) 和扩散模型 (DM)] 及其组合 [一级反应/扩散模型 (FRDM)] 以评估浸出参数并确定固定化放射性核素的类型在 RSC 矩阵中。结果表明,在动态和静态浸出条件下,使用 DIW 和 ASW 从 RSC 基质中浸出 140Ce 和 133Cs 均小于 20%,表明 140Ce 和 133Cs 的浸出行为接近于半无限介质的浸出行为。140Ce 和 133Cs 的浸出现象不能用单一模型(FRM 和 DM)完全表示,而 FRDM 最适合这些实验数据集。总体而言,140Ce 和 133Cs 的平均浸出性指数 L 值大于国际原子能机构建议的表明其可接受处置的最低限度。也可以说带有 DIW 或 ASW 的 RSC 具有固定放射性材料的潜力。
更新日期:2020-04-01
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