A substance in appreciable amount which, when associated with a
tracer of a specified substance, will carry the
tracer with it through a chemical or physical process, or prevent the
tracer from undergoing nonspecific processes due to its low concentration.
Source: PAC, 1994,
66, 2513. (
Nomenclature for radioanalytical chemistry (IUPAC Recommendations 1994)) on page 2516 [
Terms] [
Paper]