Isotopes of Fermium (Z=100)
| 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
|
|---|
Last update on
February 5, 2024
