Isotopes of Mendelevium (Z=101)

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Isotope Half-life Spin Parity Decay Mode(s) or Abundance
245Md 0.35 s (7/2) %A=100
245m1Md 0.90 ms (1/2-)
246Md 1.0 s %A=100
247Md 1.12 s %A=80 17, %SF=20 17
248Md 7 s %EC=80 10, %A=20 10, %SF < 0.05
249Md 24 s %EC=80 10, %A=20 10
250Md 52 s %EC=93 3, %A=7 3, %ECSF=0.02 sys
251Md 4.0 m %EC > 90, %A < 10
252Md 2.3 m %EC>50, %A<50
253Md 6 m %EC+%B+=100
254Md 10 m %EC < 100
254m1Md 28 m %EC < 100
255Md 27 m(7/2-) %EC=92 2, %A=8 2, %SF < 1.4
256Md 78.1 m (0-,1-) %EC=90.7 5, %A=9.3 5, %SF < 2.8
257Md 5.52 h(7/2-) %EC=85 3, %A=15 3, %SF<1
258Md 51.5 d (8-) %A=100, %SF < 0.003, %B- < 0.003, %EC < 0.003
258m1Md 57.0 m (1-) %EC > 70, %SF < 30, %A < 1.2, %B- < 30
259Md 96 m(7/2-) %SF ~ 100, %A<1.3
260Md 31.8 d %SF>73, %A < 25, %B- < 10
Isotope Explorer Nuclear Structure and Decay Data
8th Edition of the Table of Isotopes
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