Berkelium

Isotopes

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Isotope Abundance T½ (s) Decay 233Bk - 21 α ec β+ 234Bk - 1.4 · 102 α ec 236Bk - 22 ec β+ ec SF 238Bk - 1.44 · 102 ec β+ ec F 239Bk - - ec α SF 240Bk - 2.88 · 102 ec SF ec β+ 241Bk - 2.73 · 102 α ec β+ 242Bk - 4.2 · 102 ec β+ 242m2Bk - 6 · 10−7 SF 243Bk - 1.66 · 104 ec β+ α 244Bk - 1.81 · 104 ec α 244m1Bk - 8.2 · 10−7 SF 245Bk - 4.82 · 105 ec α 246Bk - 1.56 · 105 ec β+ 247Bk - 4.35 · 1010 α 248Bk - 2.84 · 108 - 248mBk - 8.53 · 104 β- ec 249Bk - 2.85 · 107 β- α SF 249m1Bk - 3 · 10−7 - 250Bk - 1.16 · 104 β- 250m1Bk - 2.9 · 10−5 - 250m2Bk - 2.13 · 10−4 - 251Bk - 3.34 · 103 β- 251mBk - 5.8 · 10−5 - 252Bk - - - 253Bk - 6 · 102 - α: alpha particle emission (4He nucleus) β+: emission of an anti-electron and a neutrino. A proton inside the nucleus is transformed into a neutron β-: emission of an electron and an anti-neutrino. A neutron inside the nucleus is transformed into a proton ec: electron capture: capture of one orbital electron by the the nucleus. A proton inside the nucleus is transformed into a neutron plus a neutrino SF: Spontaneous Fission: a nucleus spontaneously splits into fragment nuclides IT: Isomeric Transition: a level above the ground state decays via electromagnetic process n: neutron emission p: proton emission β- n (and similar): beta- decay followed by delayed neutron emission