@inproceedings{10c1735b0463498e8e76e1f87337c40b,
title = "Diffusivity and Porosity in Rock Matrix - Laboratory Methods Using Artificial and Natural Tracers",
abstract = "The nature of diffusivity and porosity in crystalline rock was studied by electrical conductivity measurements, steady-state diffusion experiments, saturation-leaching of tracers with cylindrical rock samples and analysis of the concentrations of different elements from core samples or pore water near fractures. The phenomena of main interest were dead-end porosity, ion-exclusion, sorption, and the continuity of pore networks. The modelling of experimental results was based on a modified Fick's second law for diffusion, which was solved either by analytical or numerical methods. The measured De and ε were found to statistically follow an exponential presentation: Archie's law. The existence of ion-exclusion for anions was confirmed. The connectivity of the pore network extended in the laboratory experiments at least six centimetres, in coarse-grained granite in nature several metres but in fine-grained rock samples of a uranium deposit the element mobilization effects could be seen only to the depth of 2–3 centimetres.",
author = "Matti Valkiainen and Markus Olin and Kari Uusheimo and Heikki Kumpulainen and Jarmo Lehikoinen and Arto Muurinen",
year = "1992",
doi = "10.1557/PROC-294-845",
language = "English",
series = "MRS Online Proceedings ",
publisher = "Materials Research Society",
pages = "845--850",
editor = "C.G. Interrante and R.T. Pabalan",
booktitle = "Symposium V – Scientific Basis for Nuclear Waste Management XVI",
address = "United States",
}