A fundamentally new scheme of the electronuclear method based on nuclear relativistic technol ogies is discussed; this scheme includes the formation and utilization of a limiting hard neutron spectrum in the volume of the deep subcritical active core. It is demonstrated that the development and application of nuclear relativistic technologies can be promising for solving the problem of utilizing spent nuclear fuel and global challenges of power production. The results of the first experiments performed at the Joint Institute for Nuclear Research indicate the realistic character of the main principles of relativistic nuclear technologies, in particular, the growth of beam power amplification by a factor of 2 for a deuteron beam irradiating a mas sive (315 kg) uranium target with the beam energy increasing from 1 to 4 GeV.

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New types of element-loaded (B and Gd) organic scintillators for neutron detection and neutrino experiments have been synthesized recently at JINR. Their optical, spectral, scintillation and radiopurity characteristics are presented and discussed. It is shown that the 5 % B-loaded scintillator has a light output as much as 70 % relative to the unloaded one. The same characteristics for the 3 % Gd-loaded sample is equal to 51 %. Transparency and other properties of the produced scintillators did not change at normal conditions for at least one year.

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