Dependence of counting efficiency of 1-methyl [2-14C]-imidazolidinone-2 adsorbed on the surface of various silica gels (different grain size and pore diameter) on scintillator
(PT, PPO, butyl-PBD) concentration in three scintillation solvents was investigated by means of liquid scintillation spectrometry.
It was established that the reason for deviations of the experimental points from the standard channel ratio curve is scintillation
heterogeneity of the measured system. Proposition of an additional mechanism for excitation energy transport straight from
silica gel globules to adsorbed molecules of the scintillator is discussed.