Experimental and numerical investigations of 99TcO4− diffusion in compacted SPV 200 bentonite

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 99 TcO 4 − through SPV bentonite with various densities. T...

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Bibliographic Details
Published in:Journal of radioanalytical and nuclear chemistry 2018, Vol.316 (3), p.1081-1089
Main Authors: Shih, Yu-Hung, Lee, I-Hsien, Ni, Chuen-Fa, Tsai, Tsuey-Lin, Chen, Liang-Cheng, Lee, Chuan-Pin, Tsai, Shih-Chin, Su, Te-Yen
Format: Article
Language:English
Subjects:
Backfill
Bentonite
Chemistry
Chemistry and Materials Science
Diagnostic Radiology
Diffusion
Hadrons
Heavy Ions
Inorganic Chemistry
Mathematical models
Nuclear Chemistry
Nuclear Physics
One dimensional models
Physical Chemistry
Radioisotopes
Repositories
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Summary: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 99 TcO 4 − 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, 99 Tc could be considered as non-sorbing radionuclides. The data obtained in this study provide a valuable reference for the safety assessment of waste repositories.
ISSN:0236-5731
1588-2780
DOI:10.1007/s10967-018-5800-x