1. Experimental and numerical investigations of 99TcO4− diffusion in compacted SPV 200 bentonite
- Author
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Liang-Cheng Chen, Te-Yen Su, Chuan-Pin Lee, Yu-Hung Shih, Tsuey-Lin Tsai, I-Hsien Lee, Chuen Fa Ni, and Shih-Chin Tsai
- Subjects
Technetium compounds ,Materials science ,Petroleum engineering ,Optimization algorithm ,Health, Toxicology and Mutagenesis ,Public Health, Environmental and Occupational Health ,010501 environmental sciences ,010403 inorganic & nuclear chemistry ,01 natural sciences ,Pollution ,0104 chemical sciences ,Analytical Chemistry ,Nuclear facilities ,Nuclear Energy and Engineering ,Mass transfer ,Bentonite ,Radiology, Nuclear Medicine and imaging ,Diffusion (business) ,Spectroscopy ,0105 earth and related environmental sciences - Abstract
Diffusion characteristics in bentonite are essential to quantify the transport of radionuclides through buffer/backfill materials in waste repositories. This study employs through-diffusion techniques to investigate the diffusion behavior of 99TcO4− through SPV bentonite with various densities. The apparent diffusion coefficients for bentonite densities are estimated using Marquardt–Levenberg optimization algorithm in the HYDRUS-1D model. Based on the experimental and calculation results, 99Tc could be considered as non-sorbing radionuclides. The data obtained in this study provide a valuable reference for the safety assessment of waste repositories.
- Published
- 2018