Affiliation: | (1) National Centre of Radiobiology and Radiation Protection, 132 St. Kliment Ohridsky, 1756 Sofia, Bulgaria;(2) Institute for Nuclear Research and Nuclear Energy, Bulgarian Academy of Sciences, 72 Tzarigradsko chaussee, Blvd, 1784 Sofia, Bulgaria;(3) Institute of Organic Chemistry, Bulgarian Academy of Sciences, Block 9, Acad. G. Bonchev Street, 1113 Sofia, Bulgaria |