radioactive tracer technique

in analysis
A technique for investigating recovery and loss of a microcomponent, in which a radioactively-labelled element or compound chemically identical with the microcomponent is added to the sample before preconcentration and its behaviour is followed by sensitive, rapid and selective radioactivity measurements.
PAC, 1979, 51, 1195 (Separation and preconcentration of trace substances. I - Preconcentration for inorganic trace analysis) on page 1200