Isotopes of berkelium

Template:Short description Template:Infobox berkelium isotopes Berkelium (₉₇Bk) is an artificial element, and thus a standard atomic weight cannot be given. Like all artificial elements, it has no stable isotopes. The first isotope to be synthesized was ²⁴³Bk in 1949. There are twenty known radioisotopes, from ²³³Bk and ²³³Bk to ²⁵³Bk (except ²³⁵Bk and ²³⁷Bk), and six nuclear isomers. The longest-lived isotope known is ²⁴⁷Bk with a half-life of 1,380 years; however ²⁴⁸Bk, which has not been observed to decay, may live longer.

List of isotopes

Template:Isotopes table |-id=Berkelium-233 | rowspan=2|²³³Bk | rowspan=2 style="text-align:right" | 97 | rowspan=2 style="text-align:right" | 136 | rowspan=2|233.05665(25)# | rowspan=2|40(30) s | α | ²²⁹Am | rowspan=2|3/2-# |- | β⁺? | ²³³Cm |-id=Berkelium-234 | rowspan=3|²³⁴Bk | rowspan=3 style="text-align:right" | 97 | rowspan=3 style="text-align:right" | 137 | rowspan=3|234.05732(16)# | rowspan=3|20(5) s | α (>80%) | ²³⁰Am | rowspan=3|3-# |- | β⁺ (<20%) | ²³⁴Cm |- | β⁺, SF? | (various) |-id=Berkelium-236 | rowspan=3|²³⁶Bk | rowspan=3 style="text-align:right" | 97 | rowspan=3 style="text-align:right" | 139 | rowspan=3|236.05748(39)# | rowspan=3|26(10) s | β⁺ (99.96%) | ²³⁶Cm | rowspan=2|4+# |- | β⁺, SF (0.04%) | (various) |- | α? | ²³²Am |-id=Berkelium-238 | rowspan=3|²³⁸Bk | rowspan=3 style="text-align:right" | 97 | rowspan=3 style="text-align:right" | 141 | rowspan=3|238.05820(28)# | rowspan=3|2.40(8) min | β⁺ (99.95%) | ²³⁸Cm | rowspan=3| 1# |- | β⁺, SF (0.048%) | (various) |- | α? | ²³⁴Am |-id=Berkelium-239 | rowspan=3|²³⁹Bk | rowspan=3 style="text-align:right" | 97 | rowspan=3 style="text-align:right" | 142 | rowspan=3|239.05824(22)# | rowspan=3|100# s | β⁺ | ²³⁹Cm | rowspan=3|(7/2+) |- | α? | ²³⁵Am |- | SF? | (various) |-id=Berkelium-240 | rowspan=3|²⁴⁰Bk | rowspan=3 style="text-align:right" | 97 | rowspan=3 style="text-align:right" | 143 | rowspan=3|240.05976(16)# | rowspan=3|4.8(8) min | β⁺? | ²⁴⁰Cm | rowspan=3|7−# |- | β⁺, SF (0.0020%) | (various) |- | α? | ²³⁶Am |-id=Berkelium-241 | rowspan=2|²⁴¹Bk | rowspan=2 style="text-align:right" | 97 | rowspan=2 style="text-align:right" | 144 | rowspan=2|241.06010(18)# | rowspan=2|4.6(4) min | β⁺? | ²⁴¹Cm | rowspan=2|(7/2+) |- | α? | ²³⁷Am |-id=Berkelium-242 | rowspan=3|²⁴²Bk | rowspan=3 style="text-align:right" | 97 | rowspan=3 style="text-align:right" | 145 | rowspan=3|242.06198(22)# | rowspan=3|7.0(13) min | β⁺ | ²⁴²Cm | rowspan=3|3+# |- | β⁺, SF (<3×10⁻⁵%) | (various) |- | α? | ²³⁸Am |-id=Berkelium-242m | rowspan=2 style="text-indent:1em" | ^242mBk | rowspan=2 colspan="3" style="text-indent:2em" | 2000(200)# keV | rowspan=2|600(100) ns | SF | (various) | rowspan=2| |- | IT? | ²⁴²Bk |-id=Berkelium-243 | rowspan=2|²⁴³Bk | rowspan=2 style="text-align:right" | 97 | rowspan=2 style="text-align:right" | 146 | rowspan=2|243.0630059(49) | rowspan=2|4.6(2) h | β⁺ (99.85%) | ²⁴³Cm | rowspan=2|3/2− |- | α (.15%) | ²³⁹Am |-id=Berkelium-244 | rowspan=2|²⁴⁴Bk | rowspan=2 style="text-align:right" | 97 | rowspan=2 style="text-align:right" | 147 | rowspan=2|244.065179(15) | rowspan=2|5.02(3) h | β⁺(99.994%) | ²⁴⁴Cm | rowspan=2|4− |- | α (0.006%) | ²⁴⁰Am |-id=Berkelium-244m | rowspan=2 style="text-indent:1em" | ^244mBk | rowspan=2 colspan="3" style="text-indent:2em" | 1500(500)# keV | rowspan=2|820(60) ns | SF | (various) | rowspan=2| |- | IT? | ²⁴⁴Bk |-id=Berkelium-245 | rowspan=2|²⁴⁵Bk | rowspan=2 style="text-align:right" | 97 | rowspan=2 style="text-align:right" | 148 | rowspan=2|245.0663598(19) | rowspan=2|4.95(3) d | EC (99.88%) | ²⁴⁵Cm | rowspan=2|3/2− |- | α (.12%) | ²⁴¹Am |-id=Berkelium-246 | rowspan=2|²⁴⁶Bk | rowspan=2 style="text-align:right" | 97 | rowspan=2 style="text-align:right" | 149 | rowspan=2|246.068671(64) | rowspan=2|1.80(2) d | β⁺ | ²⁴⁶Cm | rowspan=2|2(−) |- | α? | ²⁴²Am |-id=Berkelium-247 | rowspan=2|²⁴⁷Bk | rowspan=2 style="text-align:right" | 97 | rowspan=2 style="text-align:right" | 150 | rowspan=2|247.0703059(56) | rowspan=2|1.38(25)×10³ y | α | ²⁴³Am | rowspan=2|3/2− |- | SF? | (various) |-id=Berkelium-248 | rowspan=3|²⁴⁸Bk | rowspan=3 style="text-align:right" | 97 | rowspan=3 style="text-align:right" | 151 | rowspan=3|248.073142(54) | rowspan=3|>9 y | α? | ²⁴⁴Am | rowspan=3|6+# |- | EC? | ²⁴⁸Cm |- | β⁻? | ²⁴⁸Cf |-id=Berkelium-248m | rowspan=3 style="text-indent:1em" | ^248mBkTemplate:R | rowspan=3 colspan="3" style="text-indent:2em" | −20(50) keV | rowspan=3| 23.7(2) h | β⁻ (70%) | ²⁴⁸Cf | rowspan=3| 1(−) |- | EC (30%) | ²⁴⁸Cm |- | α? | ²⁴⁴Am |-id=Berkelium-249 | rowspan=3|²⁴⁹Bk | rowspan=3 style="text-align:right" | 97 | rowspan=3 style="text-align:right" | 152 | rowspan=3|249.0749831(13) | rowspan=3|327.2(3) d | β⁻ | ²⁴⁹Cf | rowspan=3|7/2+ |- | α (.00145%) | ²⁴⁵Am |- | SF (4.7×10⁻⁸%) | (various) |-id=Berkelium-249m | style="text-indent:1em" | ^249mBk | colspan="3" style="text-indent:2em" | 8.777(14) keV | 300 μs | IT | ²⁴⁹Bk | 3/2− |-id=Berkelium-250 | ²⁵⁰Bk | style="text-align:right" | 97 | style="text-align:right" | 153 | 250.0783172(31) | 3.212(5) h | β⁻ | ²⁵⁰Cf | 2− |-id=Berkelium-250m1 | style="text-indent:1em" | ^250m1Bk | colspan="3" style="text-indent:2em" | 35.59(10) keV | 29(1) μs | IT | ²⁵⁰Bk | 4+ |-id=Berkelium-250m2 | style="text-indent:1em" | ^250m2Bk | colspan="3" style="text-indent:2em" | 85.6(16) keV | 213(8) μs | IT | ²⁵⁰Bk | 7+ |-id=Berkelium-251 | ²⁵¹Bk | style="text-align:right" | 97 | style="text-align:right" | 154 | 251.080761(12) | 55.6(11) min | β⁻ | ²⁵¹Cf | (3/2−) |-id=Berkelium-251m | style="text-indent:1em" | ^251mBk | colspan="3" style="text-indent:2em" | 35.5(13) keV | 58(4) μs | IT | ²⁵¹Bk | (7/2+) |-id=Berkelium-252 | rowspan=2|²⁵²Bk | rowspan=2 style="text-align:right" | 97 | rowspan=2 style="text-align:right" | 155 | rowspan=2|252.08431(22)# | rowspan=2|1.8(5) min | β⁻? | ²⁵²Cf | rowspan=2| |- | α? | ²⁴⁸Am |-id=Berkelium-253 | ²⁵³Bk | style="text-align:right" | 97 | style="text-align:right" | 156 | 253.08688(39)# | 60# min | β⁻? | ²⁵³Cf | 3/2-# Template:Isotopes table/footer

References

• Isotope masses from:
  • Template:NUBASE 2003
• Half-life, spin, and isomer data selected from the following sources.
  • Template:NUBASE 2003
  • Template:NNDC
  • Template:CRC85