AI Article Synopsis
- The Alxa region in Inner Mongolia is being considered as a potential site for storing high-level radioactive waste in China, where long-term exposure to radiation can significantly alter materials like clay.
- A study using Co gamma rays tested the effects of radiation on clay’s structure and its ability to absorb uranium (U(Ⅵ)), focusing on doses of 1, 2, and 3 MGy.
- Results showed that while the clay experienced minimal structural changes, its ability to adsorb U(Ⅵ) decreased after irradiation, with notable alterations in iron content and layering.
Article Abstract
The Alxa region (Inner Mongolia, China) is one of the areas preselected for use as a geological repository of high-level radioactive waste in China. Radioactive waste produces radioactive rays during long-term storage, and the cumulative absorbed dose in 1000 years can significantly exceed the maximum of 0.7 MGy, thereby challenging the long-term adsorption stability of clay. This study employed Co gamma (γ)-rays to irradiate clay in air under a dose rate of 10 kGy/h. The changes in the internal structure and mechanisms of clay under different gamma radiation doses (1, 2, and 3 MGy) were investigated. Additionally, the adsorption properties of irradiated clay for U(Ⅵ) were tested under different conditions. The clay samples underwent minimal structural changes following high-dose irradiation, and the interlayer spacing was altered due to the fractured framework, dehydroxylation, and radiolysis of water. After irradiation, the Fe (Ⅱ) content in clay was significantly increased, unlike Fe (Ⅲ) content. The adsorption mechanisms of clay before and after the experiments were verified, revealing that the adsorption capacity of irradiated clay to U(Ⅵ) is reduced.
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| http://dx.doi.org/10.1016/j.apradiso.2022.110102 | DOI Listing |
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