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JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY · 2022 ·Vol. 331 ·期 5 ·2159-2167 · IF 1.754

Simulation of nuclide migration in a middle- and low-level radioactive waste repository based on GMS

Wang Litao,Cheng Jianfeng,Bao Chenyang,Wang Yanhui,Jiang Qiao,Pan Yuelong,Liu Yu,Hong Tao,Tuo Xianguo,Leng Yangchun

Groundwater is the most important factor contributing to the diffusion and migration of radionuclides in the repository. In this paper, the characteristic parameters of granite in a repository are obtained from static and dynamic experiments to simulate a three-dimensional geological model of the repository with the help of a groundwater modeling system (GMS). It was shown that the longest distances of 137 Cs and 60 Co migrations for 500 a were 146.66 m and 145.04 m, respectively. This work could be of great significance to ensure the long-term safe operation of this type of waste repository.

CAS / MDL: 7791-13-1

研究领域: 环境科学 · 放射生物学

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FOOD HYDROCOLLOIDS · 2024 · IF 11

Impact of Co-60 γ-ray irradiation on the cross-linking and stability of fish collagen: Structural changes and digestibility

Junwei Qin,Litong Liu,Chengdu Miao,Bifeng Lan,Tao Liao,Xiaofei Tian,Zhenqiang Wu

Irradiation can promote the cross-linking of collagen to enhance its biological properties, but the molecular changes in irradiated collagen have few been investigated. This study aimed to explore the impact of irradiation treatment on the molecular structure stabilization and cross-linking degree of skin collagen. The results showed that collagen in solution was more susceptible to Co-60 gamma irradiation than that in fish skin and in sponge forms. The solubility of collagen in solution decreased by more than 80% and the carbonyl content increased by more than 4 times compared with the control group after 12 kGy irradiation. Spectroscopic analysis and sodium dodecyl sulfate - polyacrylamide gel electrophoresis (SDS-PAGE) showed that collagen in solution was cross-linked, especially at high irradiation doses. However, the triple helical structure of skin collagen and collagen sponge remained intact. Furthermore, irradiation also reduced the sensitivity of collagen to collagenase. Gastrointestinal digestion results showed that the antioxidant activity of collagen increased at 1–3 kGy doses and decreased at 9–12 kGy doses. Collagen irradiated at high doses (9–12 kGy) was more difficult to digest and had a larger average particle size. This study provides a potential new approach for the preparation of stable fishery-derived collagen with excellent antioxidant activity and resistance to digestion by irradiation treatment.

CAS / MDL: 119-26-6 1898-66-4 151-21-3 110-18-9 28752-68-3

研究领域: 食品科学 · 生物化学

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Simulation of nuclide migration in a middle- and low-level radioactive waste repository based on GMS

Impact of Co-60 γ-ray irradiation on the cross-linking and stability of fish collagen: Structural changes and digestibility