The use of radioactive tracers has become a common way of making certain difficult measurements. It is particularly useful in tests on full scale operating equipment where significant modification of thruput or operating conditions is difficult or impossible. A tracer may be selected to represent a small portion of the entire stream, or to have special properties so that one element of the stream can be followed. An example of the latter application of particular interest to corrosion engineers is the tagging of corrosion inhibitors to follow the inhibitor through a process unit.

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