[en] Two ways of light-collection uniformity increase in extended scintillators on the account of radiative mechanism of energy transfer between luminescent components are proposed and realized for the first time. With the decrease of the spectrum shifter concentration the energy transfer from the first component to the spectrum shifter becomes mainly radiative. It allows to compensate the light-collection non-uniformity about 1.5 times by means of the effective reflector, positioned without an optical contact to the scintillator lateral surfaces and the optical filter which let the radiation transmission only from the spectrum shifter to the photomultiplier. In the second case the compensated light-collection non-uniformity exceeds 10 times, using an external film spectrum shifter, covering the lateral surfaces of the scintillator with an optical contact, and the filter, transmitting the radiation from the spectrum shifter. The decrease of the scintillation signal from the most distant parts of the scintillator constitutes 1.5-2 times in the methods under consideration