1. Khlopin Radium Institute, 2nd Murinskii pr. 28, St. Petersburg, 194021 Russia
2. Radiochemical Department, St. Petersburg State University, Universitetskaya nab. 7/9, St. Petersburg, 199034 Russia
3. Department of Crystallography, Institute of Earth Sciences, St. Petersburg State University, Universitetskaya nab. 7/9, St. Petersburg, 199034 Russia
4. Petersburg Nuclear Physics Institute, mkr. Orlova roshcha 1, Gatchina, Leningrad oblast 188300 Russia