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The migration of radionuclides  237 Np,  238 Pu and  241 Am in a weak loess aquifer were investigated in-situ with a bisectional experimental column. The experimental column was constructed by connecting 2 undisturbed aquifer medium columns together and inserted into the aquifer horizontally through holes pre-prepared in the wall of a vertical experimental shaft in an Underground Research Facility at the CIRP´s field test site. Quartz containing radionuclides  3 H,  237 Np,  238 Pu and  241 Am was introduced as a point source at the center of the experimental column. Outflow water of the experimental column was collected and  3 H in the outflow was determined for calculating the water flow velocity through the experimental column. The experimental column was cut into slices of 0.3 cm long and the radioactivity of  237 Np,  238 Pu and  241 Am in the sliced soil samples was analyzed when the experiment was completed.

The migration of radionuclides 237 Np, 238 Pu and 241 Am in a weak loess aquifer: A field column experiment