Abstract
TRACERS are used extensively for the purpose of measuring the absolute flux of a substance through a membrane from, say, side A to side B in the presence of a flux from B to A. Often the system is in a steady state and the two fluxes are equal; but the rate of appearance of tracer atoms (x′) on side B remote from their origin (side A) is used as a measure of the flux A → B, with due mathematical allowance for any back flow of x′, B → A.
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EDWARDS, C., HARRIS, E. Do Tracers measure Fluxes?. Nature 175, 262 (1955). https://doi.org/10.1038/175262a0
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DOI: https://doi.org/10.1038/175262a0
