Concentration dependence of diffusion coefficients of 22Na+ and 134Cs+ in opalinus clay rocks

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21110%2F19%3A00335107" target="_blank" >RIV/68407700:21110/19:00335107 - isvavai.cz</a>
Result on the web
<a href="http://dx.doi.org/10.1063/1.5114058" target="_blank" >http://dx.doi.org/10.1063/1.5114058</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1063/1.5114058" target="_blank" >10.1063/1.5114058</a>

Result language
angličtina
Original language name
Concentration dependence of diffusion coefficients of 22Na+ and 134Cs+ in opalinus clay rocks
Original language description
We developed an inverse technique based on the Boltzmann-Matano method from which apparent coefficients of diffusion of decaying radionuclides in saturated porous media can be calculated. The technique uses the assumption that the concentration profiles (or breakthrough curves) have S shapes and can be well approximated by the error function with three adjustable parameters (the position, height, and slope). The resulting dependence of the apparent diffusion coefficient on concentration was given as a rather simple formula involving inverse error function. Here we wish to apply this straightforward technique to obtain concentration dependences of the apparent diffusion coefficients of 22Na+ and 134Cs+ for which the corresponding breakthrough curves were measured for two types of dense opalinus clay rocks. We compare our more general results with those from the original study in which the apparent diffusion coefficient was assumed to be constant and indicate that the latter approach need not be appropriate.
Czech name
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Czech description
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Project
<a href="/en/project/GA17-11635S" target="_blank" >GA17-11635S: Cement composite for radionuclide encasement</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year
2019
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Article name in the collection
International Conference on Numerical Analysis and Applied Mathematics (ICNAAM-2018)
ISBN
978-0-7354-1854-7
ISSN
0094-243X
e-ISSN
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Number of pages
4
Pages from-to
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Publisher name
American Institute of Physics Inc.
Place of publication
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Event location
Rhodes
Event date
Sep 13, 2018
Type of event by nationality
WRD - Celosvětová akce
UT code for WoS article
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