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首页> 外文期刊>Journal of Nuclear Materials: Materials Aspects of Fission and Fusion >Effects of gamma-ray irradiation on leaching of simulated Cs-133(+) radionuclides from geopolymer wasteforms
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Effects of gamma-ray irradiation on leaching of simulated Cs-133(+) radionuclides from geopolymer wasteforms

机译：γ射线辐照对地质聚合物废料中模拟Cs-133（+）放射性核素浸出的影响

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摘要

Leaching of simulated Cs-133(+) radionuclides from geopolymer wasteforms was examined with regard to effects from gamma-ray irradiation. Specifically, the compressive strengths, microstructures, pore structures, and leaching resistance of geopolymer wasteforms before and after irradiation were characterized. The leaching experiments were performed by immersion of wasteforms in deionized water, ground water, and seawater. It was found that gamma rays did not produce significant morphological changes, except for changes in the pore size distribution. The cumulative leaching fraction of all the leachants from the irradiated samples increased relative to the non-radiated samples, particularly during long leaching periods (11-42 days). These results, and those from a mercury intrusion porosimeter analysis, can be attributed to irradiation-induced changes in pore structure. All the leaching indexes were greater than the minimum acceptable value of 6.0 set by the American Nuclear Society Standards committee, which indicated that the fly-ash geopolymers are suitable for radionuclide immobilization. However, the effects of gamma-ray irradiation on the immobilization of radionuclides cannot be ignored. (C) 2015 Elsevier B.V. All rights reserved.
机译：关于伽马射线辐射的影响，研究了从地质聚合物废料中浸出模拟的Cs-133（+）放射性核素。具体而言，表征了辐照前后地质聚合物废料的抗压强度，微结构，孔结构和耐浸出性。浸出实验是通过将废料浸入去离子水，地下水和海水中进行的。已经发现，除了孔径分布的变化以外，γ射线没有产生明显的形态变化。相对于未辐照的样品，来自辐照样品的所有浸出液的累积浸出率均增加，尤其是在长浸出期间（11​​-42天）。这些结果，以及来自压汞仪的分析结果，可以归因于辐射引起的孔结构变化。所有的浸出指数均大于美国核学会标准委员会设定的最小可接受值6.0，这表明粉煤灰地质聚合物适用于放射性核素的固定化。但是，伽马射线辐照对放射性核素固定化的影响不容忽视。 （C）2015 Elsevier B.V.保留所有权利。

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