Isotopes of dubnium

Isotopes of dubnium (105Db)
Main isotopes Decay
abun­dance half-life (t1/2) mode pro­duct
262Db synth 34 s α67% 258Lr
SF33% –
263Db synth 27 s SF56% –
α41% 259Lr
ε3% 263mRf
266Db synth 11 min SF –
ε 266Rf
267Db synth 1.4 h SF –
268Db synth 16 h α51% 264Lr
SF49% –
270Db synth 1 h α87% 266Lr
SF13% –

Dubnium (105Db) is a synthetic element, thus a standard atomic weight cannot be given. Like all synthetic elements, it has no stable isotopes. The first isotope to be synthesized was 261Db in 1968. Thirteen radioisotopes are known, ranging from 255Db to 270Db (except 264Db, 265Db, and 269Db), along with one isomer (257mDb); two more isomers have been reported but are unconfirmed. The longest-lived known isotope is 268Db with a half-life of 16 hours.

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