Assessment of x-ray micro-CT measurements of porosity and solute concentration distributions during diffusion in porous geologic media

被引：0
作者：
机构：
[1] Department of Earth Sciences, University of New Brunswick, Fredericton, NB
[2] Laboratory for Threat Material Detection, Department of Mechanical Engineering, University of New Brunswick, Fredericton, NB
来源：
Al, T.A. (tal@unb.ca) | 2013年 / Begell House Inc.卷 / 16期
关键词：
Computed tomography; Diffusion; Porosity; Quantitative measurements; Tracer concentration;
D O I：
10.1615/JPorMedia.v16.i8.10
中图分类号：
学科分类号：
摘要：
Using x-ray micro-computed tomography (micro-CT) for quantitative measurements in porous media is inherently challenged by uncertainties, which need to be identified and quantified to enable meaningful interpretation of measurements. For this purpose, we present results of experiments using micro-CT to measure the three-dimensional distribution of diffusion-accessible porosity and time-variant iodide tracer concentration within dolostone and sandstone samples. The precision, detection limits and spatial resolution of measurements were determined. Using a 0.6 M iodide tracer, the precision of attenuation coefficient measurement was approximately ±4%, in both the dolostone and sandstone samples. The precision for diffusion-accessible porosity and solute concentration measurements were ±7% and ±0.04 M, with detection limits of 20% and 0.12 M, respectively. The spatial resolution of measurement was 40 μm, representing the minimum size of features that can be distinctively resolved in a reconstructed image with 18.23 μm voxel size. © 2013 by Begell House, Inc.
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页码：683 / 694
页数：11
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