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Updated: Oct 6, 2025

Methods for Analyzing the Impacts of Natural Uranium on In Vitro Osteoclastogenesis
Published on: January 30, 2018
Study on the uranium (U(Ⅵ)) adsorption stability of high-dose γ-ray-irradiated clay
Jianfeng Cheng1, Runqiu Gu1, Panqing He2
1School of Nuclear Technology and Automation Engineering, Chengdu University of Technology, Chengdu, 610059, China.
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 60Co 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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