Longitudinal Mixing Measured by Radioactive Tracers

Abstract
A method of determining the magnitude and effect of horizontal mixing in pipes and tanks is available to the engineer through the use of radioactive tracers. These materials have shown many advantages over the commonly accepted use of salts and dyes. The foremost advantage of radioisotopes is the ability to detect them in minute concentrations, eliminating misleading density currents that may occur when brine is used. In addition, precise methods of detection are available, and, in some instances, it is not necessary to take samples of the fluid being tested.

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