# Isotopen van dubnium

Het chemisch element dubnium (Db), met een atoommassa van 262,1138 u, bezit geen stabiele isotopen en wordt dus geclassificeerd als radioactief element. De 12 radio-isotopen zijn onstabiel en hebben een relatief korte halfwaardetijd (de meeste minder dan een seconde).
In de natuur komt geen dubnium voor: alle isotopen zijn synthetisch bereid in een laboratorium. De eerste synthetische isotoop was $^{261}$Db, in 1968.
De kortstlevende isotoop van dubnium is $^{259}$Db, met een halfwaardetijd van ongeveer 0,51 seconden. De langstlevende is $^{268}$Db, met een halfwaardetijd van ongeveer 32 uur.

## Overzicht

| Nuclide | Z (p) | N (n) | Isotopische massa (u) | Halveringstijd | Radioactief verval | Kernspin |
| Kernspin |||
| $^{256}$Db | 105 | 151 | 256,10813(31) | 1,9(4) s | ${\ce {{^{256}_{105}Db}->{^{252}_{103}Lr}+\,_{2}^{4}\alpha }}$ | |
| $^{256}$Db | 105 | 151 | 256,10813(31) | 1,9(4) s | SS | |
| $^{256}$Db | 105 | 151 | 256,10813(31) | 1,9(4) s | ${\ce {{^{256}_{105}Db}->{^{256}_{104}Rf}+{e^{+}}+{\nu }_{e}}}$ | |
| $^{257}$Db | 105 | 152 | 257,10772(24) | 1,53(17) s | ${\ce {{^{257}_{105}Db}->{^{253}_{103}Lr}+\,_{2}^{4}\alpha }}$ (82%) | (9/2$^+$) |
| $^{257}$Db | 105 | 152 | 257,10772(24) | 1,53(17) s | SS (17%) | (9/2$^+$) |
| $^{257}$Db | 105 | 152 | 257,10772(24) | 1,53(17) s | ${\ce {{^{257}_{105}Db}->{^{257}_{104}Rf}+{e^{+}}+{\nu }_{e}}}$ (1%) | (9/2$^+$) |
| $^{257m}$Db | 100(100) keV | 100(100) keV | 100(100) keV | 790(130) ms | | (1/2$^−$) |
| $^{258}$Db | 105 | 153 | 258,10923(37) | 4,5(6) s | ${\ce {{^{258}_{105}Db}->{^{254}_{103}Lr}+\,_{2}^{4}\alpha }}$ (64%) | |
| $^{258}$Db | 105 | 153 | 258,10923(37) | 4,5(6) s | ${\ce {{^{258}_{105}Db}->{^{258}_{104}Rf}+{e^{+}}+{\nu }_{e}}}$ (36%) | |
| $^{258}$Db | 105 | 153 | 258,10923(37) | 4,5(6) s | SS (1%) | |
| $^{258m}$Db | 60(100) keV | 60(100) keV | 60(100) keV | 20(10) s | ${\ce {{^{258}_{105}Db}+{e^{-}}->{^{258}_{104}Rf}+{\nu }_{e}}}$ | |
| $^{258m}$Db | 60(100) keV | 60(100) keV | 60(100) keV | 20(10) s | IT → 258105Db (zelden) | |
| $^{259}$Db | 105 | 154 | 259,10961(23) | 0,51(16) s | ${\ce {{^{259}_{105}Db}->{^{255}_{103}Lr}+\,_{2}^{4}\alpha }}$ | |
| $^{260}$Db | 105 | 155 | 260,11130(25) | 1,52(13) s | ${\ce {{^{260}_{105}Db}->{^{256}_{103}Lr}+\,_{2}^{4}\alpha }}$ (88%) | |
| $^{260}$Db | 105 | 155 | 260,11130(25) | 1,52(13) s | SS (9,6%) | |
| $^{260}$Db | 105 | 155 | 260,11130(25) | 1,52(13) s | ${\ce {{^{260}_{105}Db}->{^{260}_{104}Rf}+{e^{+}}+{\nu }_{e}}}$ (2%) | |
| $^{260m}$Db | | | | 19 s | | |
| $^{261}$Db | 105 | 156 | 261,11206(25) | 1,8(4) s | SS (50%) | |
| $^{261}$Db | 105 | 156 | 261,11206(25) | 1,8(4) s | ${\ce {{^{261}_{105}Db}->{^{257}_{103}Lr}+\,_{2}^{4}\alpha }}$ (50%) | |
| $^{262}$Db | 105 | 157 | 262,11408(20) | 35(5) s | SS (71%) | |
| $^{262}$Db | 105 | 157 | 262,11408(20) | 35(5) s | ${\ce {{^{262}_{105}Db}->{^{258}_{103}Lr}+\,_{2}^{4}\alpha }}$ (26%) | |
| $^{262}$Db | 105 | 157 | 262,11408(20) | 35(5) s | ${\ce {{^{262}_{105}Db}->{^{262}_{104}Rf}+{e^{+}}+{\nu }_{e}}}$ (3%) | |
| $^{263}$Db | 105 | 158 | 263,11499(18) | 29(9) s | SS (50%) | |
| $^{263}$Db | 105 | 158 | 263,11499(18) | 29(9) s | ${\ce {{^{263}_{105}Db}->{^{259}_{103}Lr}+\,_{2}^{4}\alpha }}$ (42%) | |
| $^{263}$Db | 105 | 158 | 263,11499(18) | 29(9) s | ${\ce {{^{259}_{105}Db}->{^{259}_{104}Rf}+{e^{+}}+{\nu }_{e}}}$ (8%) | |
| $^{266}$Db | 105 | 161 | 266,12103(39) | 20 min | SS | |
| $^{266}$Db | 105 | 161 | 266,12103(39) | 20 min | ${\ce {{^{266}_{105}Db}+{e^{-}}->{^{266}_{104}Rf}+{\nu }_{e}}}$ | |
| $^{267}$Db | 105 | 162 | 267,12238(50) | 73 min | SS | |
| $^{268}$Db | 105 | 163 | 268,12545(57) | 32 uur | SS | |
| $^{268}$Db | 105 | 163 | 268,12545(57) | 32 uur | ${\ce {{^{268}_{105}Db}+{e^{-}}->{^{268}_{104}Rf}+{\nu }_{e}}}$ | |
| $^{270}$Db | 105 | 165 | 270,13071(77) | 23,15 uur | SS | |

## Overzicht van isotopen per element

* (en) R.B. Firestone, S.Y. Frank Chu & C.M. Baglin (1999) - Table of Isotopes (online versie van de cd-rom)
* (en) G. Audi, A.H. Wapstra, C. Thibault, J. Blachot & O. Bersillon (2003) - The NUBASE evaluation of nuclear and decay properties, Nuclear Physics A, 729, pp. 3-128
* (en) J.R. de Laeter, J.K. Böhlke, P. De Bièvre, H. Hidaka, H.S. Peiser, K.J.R. Rosman & P.D.P. Taylor (2003) - Atomic weights of the elements. Review 2000 (IUPAC Technical Report), Pure and Applied Chemistry, 75 (6), pp. 683–800
* (en) M.E. Wieser (2006) - Atomic weights of the elements 2005 (IUPAC Technical Report), Pure and Applied Chemistry, 78 (11), pp. 2051–2066
* (en) David R. Lide (2004) - CRC Handbook of Chemistry and Physics (85th ed.), hoofdstuk 11, CRC Press - ISBN 978-0849304859
$^{255}$Db · $^{256}$Db · $^{257}$Db · $^{257m}$Db · $^{258}$Db · $^{258m}$Db · $^{259}$Db · $^{260}$Db · $^{260m}$Db · $^{261}$Db · $^{262}$Db · $^{263}$Db · $^{264}$Db · $^{265}$Db · $^{266}$Db · $^{267}$Db · $^{268}$Db · $^{269}$Db · $^{270}$Db