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As part of the long-term diffusion project a 780 days long in situ diffusion experiment was performed at the Grimsel Test Site where several radionuclides and inactive iodine were circulated in the packered interval in granodiorite. This paper presents in situ diffusion profiles for tritiated water and iodine acquired from overcored sections of the circulation interval by out-leaching.

Polonium / Solvent extraction / Drilled well waterSummary. The suitability of solvent extraction for 210 Po analysis from groundwater samples was assessed using three extractive scintillation cocktails, POLEX, TOPO and TNOA. Validation of the extraction method was carried out using both distilled water samples with some radionuclides added and real groundwater samples. Extraction of polonium from spiked waters was successful and no co-extraction of 234 U or 238 U occurred. However, the extraction results from groundwaters differed greatly from the spiked water samples. The main interfering nuclides were 234 U and 238 U, which led to incorrect results in 210 Po analysis. Due to the co-extraction of uranium from real groundwaters, validation of the method was unfeasible.