radioimmunoassay
An
assay
based on the reversible and non-covalent binding of an
antigen
(
hapten
) by a specific
antibody
employing
radioactivity
labelled
antigen
(
hapten
) to measure the fraction of the
antigen
(
hapten
) bound to a substoichiometric amount of
antibody
.
Source:
PAC, 1994,
66
, 2513
(Nomenclature for radioanalytical chemistry (IUPAC Recommendations 1994))
on page 2524