Observation of 22Na+-Diffusion in Opalinus Clay using Positron Emission Tomography (GeoPET)


Observation of 22Na+-Diffusion in Opalinus Clay using Positron Emission Tomography (GeoPET)

Kulenkampff, J.; Gründig, M.; Zakhnini, A.; Lippmann-Pipke, J.

We applied positron emission tomography (PET) for investigating diffusion of Na-22 in Opalinus clay rock. This enables to derive diffusion parameters on the macroscopic scale of drill cores (diameter 100 mm), and thus to consider effects of anisotropy and heterogeneities. This method is complementary to laboratory measurements with common diffusion cells, which can hardly elucidate such macroscopical spatial effects.
Here, we present the measuring data as motion picture. The underlying PET-data are 20 scans over a period of 143 days after injection of synthetic Opalinus pore water, labelled with Na-22, into an axial blind hole.

Keywords: diffusion; clay rock; heterogeneity; anisotropy; positron emission tomography; PET

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Publ.-Id: 24206