Abstract
Age dating of groundwater by 14C measurements is sometimes used to indicate the residence time of the water. In fissured rock with a porous rock matrix the flow is in the fissures. The water‐filled pores of the rock may, however, be accessed by the tracer by diffusion. The residence time for a tracer can then be longer than the flow time. Model calculations were performed using data for granitic rock. For flow in large fissures (1 mm) the 14C age is 10–70 times larger than the water residence time. For small fissures (0.01 mm) the 14C age may be more than 1000 times larger.
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