Abstract
The natural isotope 79Br in the bromide form was used as a hydrological tracer of groundwater movement. Laboratory-scale infiltration experiments using cylinders cored from granite and repacked columns of crushed granite showed that the change of the natural isotopic ratio 79Br/81Br with time can be used to monitor the tracer breakthrough. Comparison was made with other non-sorbing tracers, such as tritiated water, chloride and iodide. The difference in travel time of halides was suggested to be related to the solute size. A 79Br− migration experiment in crystalline rock was carried out between two boreholes connected by a low-permeability fracture. This showed the suitability of 79Br− as a groundwater tracer also for field tests.
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