Skip to Main Content
Book Chapter

An improved model for through-diffusion experiments: application to strontium and tritiated water (HTO) diffusion in Boom Clay and compacted illite

By
M. Aertsens
M. Aertsens
Institute for Environment, Health and Safety, Belgian Nuclear Research Centre, SCK•CEN, Boeretang 200, B-2400 Mol, Belgium
Search for other works by this author on:
L. Van Laer
L. Van Laer
Institute for Environment, Health and Safety, Belgian Nuclear Research Centre, SCK•CEN, Boeretang 200, B-2400 Mol, Belgium
Search for other works by this author on:
N. Maes
N. Maes
Institute for Environment, Health and Safety, Belgian Nuclear Research Centre, SCK•CEN, Boeretang 200, B-2400 Mol, Belgium
Search for other works by this author on:
J. Govaerts
J. Govaerts
Institute for Environment, Health and Safety, Belgian Nuclear Research Centre, SCK•CEN, Boeretang 200, B-2400 Mol, Belgium
Search for other works by this author on:
Published:
January 01, 2017

Abstract

Through-diffusion experiments are conventional experiments to measure the transport parameters of radionuclides in clays. Typically, a regular replacement of the outlet volume by a tracer-free volume is performed. In the classical approach, this type of through-diffusion experiment is modelled by assuming a zero concentration in the outlet volume. Nonetheless, this assumption is not always correct, usually because the outlet volume is insufficiently large or the time between two consecutive replacements of the outlet volume is too long. Therefore, a model was developed disregarding this assumption and, instead, considers the tracer concentration in the outlet volume to evolve, as in the experiments: the flux into the outlet volume increases the tracer concentration and, at each replacement, the tracer concentration in the outlet volume is set to zero. The model was used to reproduce the diffusion of strontium (Sr) and tritiated water (HTO) in illite and Boom Clay. Model results yielded good matches with the tracer evolution in the inlet and the outlet, and the tracer profile in the core at the end of the experiment.

You do not currently have access to this article.

Figures & Tables

Contents

Geological Society, London, Special Publications

Radioactive Waste Confinement: Clays in Natural and Engineered Barriers

S. Norris
S. Norris
Radioactive Waste Management, UK
Search for other works by this author on:
J. Bruno
J. Bruno
Amphos 21, Spain
Search for other works by this author on:
M. van Geet
M. van Geet
ONDRAF/NIRAS, Belgium
Search for other works by this author on:
E. Verhoef
E. Verhoef
COVRA, The Netherlands
Search for other works by this author on:
Geological Society of London
Volume
443
ISBN electronic:
9781786203267
Publication date:
January 01, 2017

GeoRef

References

Related

Citing Books via

Close Modal
This Feature Is Available To Subscribers Only

Sign In or Create an Account

Close Modal
Close Modal