K.Yu. Kravets – Post-graduate Student, Vernadsky Institute of Geochemistry  and Analytical Chemistry of RAS (Moscow)

E-mail: Konstantin@kravets.ru

Ya.O. Simanovsky – Ph.D. (Phys.-Math.), Senior Research Scientist, 

Prokhorov General Physics Institute of RAS (Moscow)

E-mail: yasimanovskiy@mail.ru

A.A. Grechnikov – Dr.Sc. (Chem.), Leading Research Scientist, Vernadsky Institute of Geochemistry  and Analytical Chemistry of RAS (Moscow)

E-mail: agrech@bk.ru