Abstract
Tracer techniques has been used for in-situ studies related to studies of the final disposal of nuclear waste in Finland. Criteria for selection of the measurement target and preliminary testing is presented. Ground water flow rates through a packed off sections of boreholes have been measured using tracer dilution method. The results of a breakthrough test can be used to verify flow models as well as to determine parameters for the flow models. A matrix diffusion model and dispersion effected by velocity differences are considered. Radioactive isotopes 82Br and 99mTc and inactive sodium fluorescein (C20H10Na2O5) have been used as tracers.
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