A.S. Borodkov - Ph. D. (Chim.), Research Scientist, «Energomashtekhnika» Ltd; Vernadsky Institute of Geochemistry and Analytical Chemistry of Russian Academy of Sciences, Moscow, Russia E-mail: abors@mail.ru I.I. Kuzmin - Junior Research Scientist, «Energomashtekhnika» Ltd; Vernadsky Institute of Geochemistry and Analytical Chemistry of Russian Academy of Sciences, Moscow, Russia E-mail: mclaren.ilya@gmail.com A.A. Grechnikov - Ph. D. (Chim.), Head of laboratory, «Energomashtekhnika» Ltd; Vernadsky Institute of Geochemistry and Analytical Chemistry of Russian Academy of Sciences, Moscow, Russia Email: agrech@bk.ru Ya.O. Simanovsky - Ph.D. (Phys.-Math.), Senior Research Scientist, A.M. Prokhorov General Physics Institute of Russian Academy of Sciences, Moscow, Russia E-mail: yasimanovskiy@mail.ru