FIELD: quantitative analysis of biologically active materials in different samples, in particular, using iodine-125 marker. SUBSTANCE: method involves preparation of reaction mix, its incubation, detection of reaction products, development of calibration function, which provides qualitative value of material under investigation in sample. In addition method involves detection of single-photon radiation intensity Asp, and intensity of coincidence of emitted photons Ac, calculation of G parameter using equation G(Asp+2Ac)2/Ac, which is used for development of calibration function. EFFECT: increased precision of analysis. 2 dwg, 1 tbl
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