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I guess you are referring to one of the problems in the exercises. I realize that the expression that should have been used in the problem is 'the efficiency of the isotope exchange' or maybe even better, 'complete isotope exchange was achieved and the ratio between tritium and hydrogen at the acidic positions were 1.7:1'
When using radiotracers, complete isotope exchange is important (Lecture 5). Complete isotope exchange means that the ratio between non-radioactive element and radioactive isotope of the same element is the same everywhere in the system.
An isotope exchange efficiency would be a measure of how efficient the isotope exchange would be. That would mean that a part of the non-radioactive elemets would not be irreversibly excluded from interacting with the rest of the system or that the system isn't in equilibrium. In the example we are referring to this would mean that you don't have sufficient information to solve the problem (you don't know how the ratio tritium/'acidic hydrogen').
KD2430 Nuclear Exam