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Soil Science Society of America Journal Abstract -

On the Use of Radioactive Tracers in Diffusion Experiments1


This article in SSSAJ

  1. Vol. 31 No. 5, p. 604-608
    Received: Dec 19, 1966
    Accepted: May 26, 1967

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  1. K. S. Mokady and
  2. D. Zaslavsky



The use of radio-isotopes for flow (viscous or molecular) experiments is useful mostly because of the complete analogy between the flow of the tagged and the untagged species. The analogy requires that the equation of flow and the initial and boundary conditions would lead to similar solutions for the two isotopes. In many cases a correction for the decay in radioactivity leads to such an analogy. However, in the presence of adsorptive processes, or flow with sinks, the mathematical analogy may fail. This limitation occurs with time-dependent sinks. It sometimes can be eleviated, e.g., if the radioactive tracer is of long half life compared with the length of the experiment.

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