Americium Isotopic Data
Isotope |
Isotopic Mass amu |
% Abundance |
T1/2 |
T1/2 Units |
Mass Excess KeV |
Binding Energy Per Nucleon KeV |
Decay Mode |
Branching Ratio |
231Am | 231.04556 (32) |
| 30 | s | 42,440 (300) | 7,566 (1) | B+ ? |
|
232Am | 232.04659 (32) |
| 1.31 | m | 43,400 (300) | 7,564 (1) | B+ | ? |
233Am | 233.04635 (11) |
| 3.2 | m | 43,170 (100) | 7,567 (0) | B+ ? |
|
234Am | 234.04781 (22) |
| 2.32 | m | 44,530 (210) | 7,563 (1) | B+~100 |
|
235Am | 235.04795 (13) |
| 9.9 | m | 44,660 (120) | 7,565 (1) | B+~100 |
|
236Am | 236.04958 (11) |
| 30 | m | 46,180 (100) | 7,561 (0) | B+ ? |
|
237Am | 237.049996 (64) |
| 73 | m | 46,571 (59) | 7,561 (0) | B+~100 |
|
238Am | 238.051984 (54) |
| 98 | m | 48,423 (51) | 7,555.6 (2.1) | B+ | 100 |
239Am | 239.0530245 (26) |
| 11.9 | h | 49,392.0 (2.4) | 7,553.68 (1) | EC~100 |
|
240Am | 240.055300 (15) |
| 50.8 | h | 51,512 (14) | 7,547.01 (5.8) | B+ | 100 |
241Am | 241.0568291 (20) |
| 432.2 | y | 52,936.0 (1.8) | 7,543.272 (8) | A | 100 |
242Am | 242.0595492 (20) |
| 16.02 | h | 55,469.7 (1.8) | 7,534.984 (8) | B- | 82.7 3 |
243Am | 243.0613811 (25) |
| 7.37 | ky | 57,176.1 (2.3) | 7,530.169 (9) | A | 100 |
244Am | 244.0642848 (22) |
| 10.1 | h | 59,881.0 (2.1) | 7,521.301 (9) | B- | 100 |
245Am | 245.0664521 (37) |
| 2.05 | h | 61,899.7 (3.5) | 7,515.31 (1.4) | B- | 100 |
246Am | 246.069775 (20) |
| 39 | m | 64,995 (18) | 7,504.99 (7.4) | B- | 100 |
247Am | 247.07209 (11) |
| 23 | m | 67,150 (100) | 7,499 (0) | B- | 100 |
248Am | 248.07575 (22) |
| 3 | m | 70,560 (200) | 7,487 (1) | B- ? |
|
249Am | 249.07848 (32) |
| 1 | m | 73,100 (300) | 7,479 (1) | B- ? |
|
238mAm | 238.051984 (54) |
| 35 | us | 48,423 (51) | 7,555.6 (2.1) | SF~100 | |
239mAm | 239.0530245 (26) |
| 163 | ns | 49,392.0 (2.4) | 7,553.68 (1) | SF~100 |
|
241mAm | 241.0568291 (20) |
| 1.5 | us | 52,936.0 (1.8) | 7,543.272 (8) | 0 |
|
242mAm | 242.0595492 (20) |
| 141 | y | 55,469.7 (1.8) | 7,534.984 (8) | IT~100 |
|
244mAm | 244.0642848 (22) |
| 26 | m | 59,881.0 (2.1) | 7,521.301 (9) | B-~100 |
|
246mAm | 246.069775 (20) |
| 25 | m | 64,995 (18) | 7,504.99 (7.4) | B-~100 |
|
242m1Am | 242.0595492 (20) |
| 14 | ms | 55,469.7 (1.8) | 7,534.984 (8) | SF~100 |
|
Data Source: ENSDF March 2005
©Radiochemistry Society 2005