Isotopes
| Isotope |
Half-life |
Decay mode |
Discovery year |
Reaction |
|---|---|---|---|---|
| 260Bh | 00000035 !35 ms | α | 2007 | 209Bi(52Cr,n) |
| 261Bh | 000000118 !11.8 ms | α | 1986 | 209Bi(54Cr,2n) |
| 262Bh | 00000084 !84 ms | α | 1981 | 209Bi(54Cr,n) |
| 262mBh | 000000096 !9.6 ms | α | 1981 | 209Bi(54Cr,n) |
| 263Bh | 000000002 !0.2? ms | α ? | unknown | — |
| 264Bh | 000097 !0.97 s | α | 1994 | 272Rg(—,2α) |
| 265Bh | 00009 !0.9 s | α | 2004 | 243Am(26Mg,4n) |
| 266Bh | 00009 !0.9 s | α | 2000 | 249Bk(22Ne,5n) |
| 267Bh | 0017 !17 s | α | 2000 | 249Bk(22Ne,4n) |
| 268Bh | 0025 !25? s | α, SF? | unknown | — |
| 269Bh | 0025 !25? s | α ? | unknown | — |
| 270Bh | 0061 !61 s | α | 2006 | 282Uut(—,3α) |
| 271Bh | 00012 !1.2 s | α | 2003 | 287Uup(—,4α) |
| 272Bh | 00098 !9.8 s | α | 2005 | 288Uup(—,4α) |
| 273Bh | 5400 !90? min | α, SF ? | unknown | — |
| 274Bh | 0054 !~54 s | α | 2009 | 294Uus(—,5α) |
| 275Bh | 2400 !40? min | SF ? | unknown | — |
Bohrium has no stable or naturally-occurring isotopes. Several radioactive isotopes have been synthesized in the laboratory, either by fusing two atoms or by observing the decay of heavier elements. Eleven different isotopes of bohrium have been reported with atomic masses 260–262, 264–267, 270–272, 274, one of which, bohrium-262, has a known metastable state. All of these decay only through alpha decay, although some unknown bohrium isotopes are predicted to undergo spontaneous fission.
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