Isotopes of Einsteinium (Z=99)

Click on an isotope to get more information about its decay
Isotope Half-life Spin Parity Decay Mode(s) or Abundance
240Es
241Es 9 s %A=100
242Es 40 s %A ~ 100, %ECSF=1.4 8
243Es 21 s %EC < 70, %A > 30
244Es 37 s %EC=96 3, %A=4 3, %ECSF=0.01 sys
245Es 1.1 m(3/2-) %EC=60 10, %A=40 10
246Es 7.7 m (4-,6+) %EC=90.1 18, %A=9.9 18, %ECSF=0.003 sys
247Es 4.55 m(7/2+) %EC ~ 93, %A ~ 7
248Es 27 m (2-,0+) %EC>99, %A ~ 0.25, %ECSF=3E-5 sys
249Es 102.2 m 7/2(+) %EC=99.43 8, %A=0.57 8
250Es 8.6 h (6+) %EC > 97, %A < 3 sys
250m1Es 2.22 h 1(-) %EC > 99, %A < 1 sys
251Es 33 h(3/2-) %EC=99.51 12, %A=0.49 12
252Es 471.7 d (5-) %A=76 4, %EC=24 2, %B- ~ 0.01
253Es 20.47 d 7/2+ %A=100, %SF=8.9E-6 3
254Es 275.7 d(7+) %A=100, %EC<1E-4, %B-=1.74E-6 8, %SF<3E-6
254m1Es 39.3 h 2+ %B-=98 2, %A=0.33 1, %IT<3, %EC=0.078 6, %SF<0.045
255Es 39.8 d(7/2+) %B-=92.0 4, %A=8.0 4, %SF=0.0045 3
256Es 25.4 m (1+) %B-=100
256m1Es 7.6 h (8+) %B- ~ 100, %B-SF=0.002
257Es
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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