A sensitive improved method for analyzing diffusion coefficients of Cs in compacted bentonite with different lengths
Author:
Liu Zhenxing12, Sun Yuzhen23, Kong Jie4, Lee Chuan-Pin2, Hua Rong2, Liu Weigang2, Wang Zhifen2, Jiang Qifeng2, Li Boping5
Affiliation:
1. School of Geosciences, East China University of Technology , Nanchang 330013 , Jiangxi , China 2. State Key Laboratory of Nuclear Resources and Environment, East China University of Technology , Nanchang 330013 , Jiangxi , China 3. Jiangxi College of Traditional Chinese Medicine , Fuzhou 344000 , Jiangxi , China 4. Huaneng Shandong Shidao Bay Nuclear Power Co., Ltd , Rongcheng 264300 , Shandong , China 5. Beijing Research Institute of Uranium Geology , Beijing , 100029 , China
Abstract
Abstract
Based on the one-dimensional diffusion theory, the diffusion parameters were obtained from numerical fitting by the Cyclic Initial Value (CIV) program written by MATLAB. Taking the through-diffusion experimental of cesium (stable isotope 133Cs) as an example, on the premise of ensuring accuracy, fitting calculation was used to obtain the diffusion equilibrium time of Cs in different lengths bentonite column. The fitting results of diffusion test for tritium water (HTO) and Cs are both very well. The calculation results of the equilibrium time for Cs diffusion show that the equilibrium time obtained by CIV is less than the experimental period in both groundwater (GW) and seawater (SW). In GW environment, when the sensitivity is at the maximum setting value, the diffusion coefficient of Cs in 1.5 cm bentonite column could be calculated in a shorter period of time. Compared with the experimental period, the time was shortened by 110 days. The main purpose is to verify the feasibility of CIV through the experimental data of Cs in different column lengths. The CIV program can also be used to fit and calculate the experimental data of other ongoing diffusion experiments and get the equilibrium time required for diffusion experiments. It shows that the proposed models offer the advantages of saving experimental time and reducing experimental waste.
Publisher
Walter de Gruyter GmbH
Subject
Physical and Theoretical Chemistry
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