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 nineteen known radioisotopes, from ²³³Bk to ²⁵³Bk (except ²³⁵Bk and ²³⁷Bk), and seven 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|Template:Val | α (82%) | ²²⁹Am | rowspan=2|3/2−# |- | β⁺? (18%) | ²³³Cm |-id=Berkelium-234 | rowspan=2|²³⁴Bk | rowspan=2 style="text-align:right" | 97 | rowspan=2 style="text-align:right" | 137 | rowspan=2|234.05732(16)# | rowspan=2|Template:Val | α (>80%) | ²³⁰Am | rowspan=2|3−# |- | β⁺ (<20%) | ²³⁴Cm |-id=Berkelium-236 | rowspan=2|²³⁶Bk | rowspan=2 style="text-align:right" | 97 | rowspan=2 style="text-align:right" | 139 | rowspan=2|236.05748(39)# | rowspan=2|Template:Val | β⁺ (99.96%) | ²³⁶Cm | rowspan=2|4+# |- | β⁺, SF (0.04%) | (various) |-id=Berkelium-238 | rowspan=2|²³⁸Bk | rowspan=2 style="text-align:right" | 97 | rowspan=2 style="text-align:right" | 141 | rowspan=2|238.05820(28)# | rowspan=2|Template:Val | β⁺ (99.95%) | ²³⁸Cm | rowspan=2| 1# |- | β⁺, SF (0.048%) | (various) |-id=Berkelium-239 | ²³⁹Bk | style="text-align:right" | 97 | style="text-align:right" | 142 | 239.05824(22)# | 100# s | β⁺ | ²³⁹Cm | (7/2+) |-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|Template:Val | β⁺? | ²⁴⁰Cm | rowspan=3|7−# |- | α? | ²³⁶Am |- | β⁺, SF (0.0013%) | (various) |-id=Berkelium-241 | ²⁴¹Bk | style="text-align:right" | 97 | style="text-align:right" | 144 | 241.06010(18)# | Template:Val | β⁺ | ²⁴¹Cm | (7/2+) |-id=Berkelium-242 | rowspan=2|²⁴²Bk | rowspan=2 style="text-align:right" | 97 | rowspan=2 style="text-align:right" | 145 | rowspan=2|242.06200(14)# | rowspan=2|Template:Val | β⁺ | ²⁴²Cm | rowspan=2|3+# |- | β⁺, SF (<3×10⁻⁵%) | (various) |-id=Berkelium-242m | style="text-indent:1em" | ^242mBk | colspan="3" style="text-indent:2em" | 2000(200)# keV | Template:Val | SF | (various) | |-id=Berkelium-243 | rowspan=2|²⁴³Bk | rowspan=2 style="text-align:right" | 97 | rowspan=2 style="text-align:right" | 146 | rowspan=2|243.063006(5) | rowspan=2|Template:Val | β⁺ (99.85%) | ²⁴³Cm | rowspan=2|3/2− |- | α (0.15%) | 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|Template:Val | β⁺? (99.994%) | ²⁴⁴Cm | rowspan=2|4− |- | α (0.006%) | ²⁴⁰Am |-id=Berkelium-244m | style="text-indent:1em" | ^244mBk | colspan="3" style="text-indent:2em" | 1500(500)# keV | Template:Val | SF | (various) | |-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|Template:Val | EC (99.88%) | ²⁴⁵Cm | rowspan=2|3/2− |- | α (0.12%) | ²⁴¹Am |-id=Berkelium-246 | ²⁴⁶Bk | style="text-align:right" | 97 | style="text-align:right" | 149 | 246.06867(6) | Template:Val | β⁺ | ²⁴⁶Cm | 2(−) |-id=Berkelium-247 | ²⁴⁷Bk | style="text-align:right" | 97 | style="text-align:right" | 150 | 247.070306(6) | Template:Val | α | ²⁴³Am | 3/2− |-id=Berkelium-248 | rowspan=3|²⁴⁸Bk | rowspan=3 style="text-align:right" | 97 | rowspan=3 style="text-align:right" | 151 | rowspan=3|248.07314(5) | rowspan=3|>9 y | α? | ²⁴⁴Am | rowspan=3|6+# |- | EC? | ²⁴⁸Cm |- | β⁻? | ²⁴⁸Cf |-id=Berkelium-248m | rowspan=2 style="text-indent:1em" | ^248mBkTemplate:R | rowspan=2 colspan="3" style="text-indent:2em" | −20(50) keV | rowspan=2| 23.7(2) h | β⁻ (70%) | ²⁴⁸Cf | rowspan=2| 1(−) |- | EC (30%) | ²⁴⁸Cm |-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|Template:Val | β⁻ | ²⁴⁹Cf | rowspan=3|7/2+ |- | α (0.00145%) | 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 | Template:Val | IT | ²⁴⁹Bk | 3/2− |-id=Berkelium-250 | ²⁵⁰Bk | style="text-align:right" | 97 | style="text-align:right" | 153 | 250.078317(3) | Template:Val | β⁻ | ²⁵⁰Cf | 2− |-id=Berkelium-250m1 | style="text-indent:1em" | ^250m1Bk | colspan="3" style="text-indent:2em" | 35.59(10) keV | Template:Val | IT | ²⁵⁰Bk | 4+ |-id=Berkelium-250m2 | style="text-indent:1em" | ^250m2Bk | colspan="3" style="text-indent:2em" | 85.6(16) keV | Template:Val | IT | ²⁵⁰Bk | 7+ |-id=Berkelium-251 | ²⁵¹Bk | style="text-align:right" | 97 | style="text-align:right" | 154 | 251.080761(12) | Template:Val | β⁻ | ²⁵¹Cf | (3/2−) |-id=Berkelium-251m | style="text-indent:1em" | ^251mBk | colspan="3" style="text-indent:2em" | 35.5(13) keV | Template:Val | IT | ²⁵¹Bk | (7/2+) |-id=Berkelium-252 | ²⁵²Bk | style="text-align:right" | 97 | style="text-align:right" | 155 | 252.08431(22)# | Template:Val | β⁻ | ²⁵²Cf | |-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