Isotopes of Berkelium (Z=97)

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Isotope Half-life Spin Parity Decay Mode(s) or Abundance
235Bk
236Bk %EC+%B+=?
237Bk
238Bk 144 s %EC+%B+=100, %ECSF=0.048 2
239Bk (7/2+)
240Bk 4.8 m %EC+%B+=100, %ECSF=1E-3 sys
241Bk (7/2+)
242Bk 7.0 m %EC+%B+=100
242m1Bk 9.5 ns
242m2Bk 0.60 us
243Bk 4.5 h(3/2-) %EC ~ 99.85, %A ~ 0.15
243m1Bk 5 ns
244Bk 4.35 h(1-) %EC=99.994 2, %A=0.006 2
245Bk 4.94 d 3/2- %EC=99.88 1, %A=0.12 1
245m1Bk 2 ns
246Bk 1.80 d 2(-) %EC=100, %A<0.2 sys
247Bk 1380 y (3/2-) %A < 100
248Bk 9 y (6+) %A>70
248m1Bk 23.7 h 1(-) %B-=70 5, %EC=30 5, %A<0.001
249Bk 320 d 7/2+ %B-=99.99855 8, %A=0.00145 8, %SF=4.76E-8 23
250Bk 3.217 h 2- %B-=100
251Bk 55.6 m (3/2-) %B-=100, %A ~ 1E-5
252Bk
253Bk
254Bk
Isotope Explorer Nuclear Structure and Decay Data
8th Edition of the Table of Isotopes
Isotopes Project Home Page
Lawrence Berkeley National Laboratory
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