Isotopes of Fermium (Z=100)
Click on an isotope to get more information about its decay
Isotope
|
Half-life
|
Spin
Parity
|
Decay Mode(s) or
Abundance |
242Fm
| 0.8 ms | 0+
|
%SF=100
|
243Fm
| 0.18 s |
|
%A < 100, %SF < 0.5, %EC=?
|
244Fm
| 3.3 ms | 0+
|
%SF=100
|
245Fm
| 4.2 s |
|
%A=100, %SF < 0.11
|
246Fm
| 1.1 s | 0+
|
%A=92 3, %SF=7.3 24, %EC<1 sys
|
247Fm
| 35 s |
|
%A > 50, %EC+%B+ < 50
|
247m1Fm
| 9.2 s |
|
%A < 100
|
248Fm
| 36 s | 0+
|
%A=93 7, %EC ~ 7, %SF=0.10 5
|
249Fm
| 2.6 m | (7/2+)
|
%EC ~ 85 sys %A ~ 15 sys
|
250Fm
| 30 m | 0+
|
%A>90, %EC<10, %SF=0.0069 12
|
250m1Fm
| 1.8 s |
|
%IT>80, %SF < 8E-5
|
251Fm
| 5.30 h | (9/2-)
|
%EC=98.20 13, %A=1.80 13
|
252Fm
| 25.39 h | 0+
|
%A=99.9977 2, %SF=0.00232 15
|
253Fm
| 3.00 d | 1/2+
|
%EC=88 1, %A=12 1
|
254Fm
| 3.240 h | 0+
|
%A=99.9408 2, %SF=0.0592 3
|
255Fm
| 20.07 h | 7/2+
|
%A=100, %SF=2.3E-5 14
|
256Fm
| 157.6 m | 0+
|
%SF=91.9 3, %A=8.1 3
|
257Fm
| 100.5 d | (9/2+)
|
%A=99.790 5, %SF=0.210 5
|
258Fm
| 370 us | 0+
|
%SF=100
|
259Fm
| 1.5 s |
|
%SF=100
|
Isotope Explorer Nuclear Structure and Decay Data
8th Edition of the Table of Isotopes
Isotopes Project Home Page
Lawrence Berkeley National Laboratory