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

Kód výsledku v 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>

Výsledek na webu

<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>

Jazyk výsledku

angličtina

Název v původním jazyce

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

Popis výsledku v původním jazyce

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.

Název v anglickém jazyce

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

Popis výsledku anglicky

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.

Druh

D - Stať ve sborníku

CEP obor

—

OECD FORD obor

20501 - Materials engineering

Projekt

<a href="/cs/project/GA17-11635S" target="_blank" >GA17-11635S: Cementové kompozity k imobilizaci radionuklidů</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2019

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název statě ve sborníku

International Conference on Numerical Analysis and Applied Mathematics (ICNAAM-2018)

ISBN

978-0-7354-1854-7

ISSN

0094-243X

e-ISSN

—

Počet stran výsledku

4

Strana od-do

—

Název nakladatele

American Institute of Physics Inc.

Místo vydání

—

Místo konání akce

Rhodes

Datum konání akce

13. 9. 2018

Typ akce podle státní příslušnosti

WRD - Celosvětová akce

Kód UT WoS článku

—