|All Dubnium properties were studies only with single atoms of 261Db (T1/2 = 1.8 seconds). The first information of Dubnium chemical properties were identified by I. Zvara and coworkers in 1970 in USSR/Russia. In these experiments, Dubnium atoms, synthesized as described earlier (243Am(22Ne, 4n)261Db) were slow down in a stream on N2 at 300°C with addition of gaseous chloride-rich compounds - TiCl4 and SOCl2 with subsequent analysis in thermochromatographic column. In total 18 atoms of Dubnium were detected, these atoms were adsorbed between Hafnium and Niobium. |
In 1977 Dubnium was detected in the USA by L-edge X-Ray radiation of element 103 synthesized by α-decay on 260Db (T1/2 = 1.5 seconds).