Selenium Isotopic Data
Isotope |
Isotopic Mass amu |
% Abundance |
T1/2 |
T1/2 Units |
Mass Excess KeV |
Binding Energy Per Nucleon KeV |
Decay Mode |
Branching Ratio |
65Se | 64.96466 (64) |
| <50 | ms | -32,920 (600) | 8,169 (9) | B+ | 100 |
66Se | 65.95521 (32) |
| 33 | ms | -41,720 (300) | 8,300 (5) | B+ | 100 |
67Se | 66.95009 (21) |
| 133 | ms | -46,490 (200) | 8,368 (3) | B+ | 100 |
68Se | 67.941798 (35) |
| 35.5 | s | -54,215 (33) | 8,477.4 (4.8) | B+ | 100 |
69Se | 68.939558 (37) |
| 27.4 | s | -56,302 (34) | 8,501.8 (5) | B+ | 100 |
70Se | 69.933391 (66) |
| 41.1 | m | -62,046 (62) | 8,577.7 (8.8) | B+ | 100 |
71Se | 70.932242 (34) |
| 4.74 | m | -63,116 (32) | 8,585.6 (4.4) | B+ | 100 |
72Se | 71.927112 (13) |
| 8.4 | d | -67,894 (12) | 8,644.9 (1.7) | EC | 100 |
73Se | 72.926765 (11) |
| 7.15 | h | -68,218 (11) | 8,641.4 (1.5) | B+ | 100 |
74Se | 73.9224764 (18) | 0.89 (4) | stable |
| -72,212.7 (1.7) | 8,687.71 (2.3) |
|
|
75Se | 74.9225234 (18) |
| 119.779 | d | -72,169.0 (1.7) | 8,678.91 (2.2) | EC | 100 |
76Se | 75.9192136 (18) | 9.37 (29) | stable |
| -75,252.1 (1.7) | 8,711.48 (2.2) |
|
|
77Se | 76.9199140 (18) | 7.63 (16) | stable |
| -74,599.6 (1.7) | 8,694.69 (2.1) |
|
|
78Se | 77.9173091 (18) | 23.77 (28) | stable |
| -77,026.1 (1.7) | 8,717.81 (2.1) |
|
|
79Se | 78.9184991 (18) |
| 295 | ky | -75,917.6 (1.7) | 8,695.59 (2.1) | B- | 100 |
80Se | 79.9165213 (21) | 49.61 (41) | stable |
| -77,759.9 (2) | 8,710.82 (2.5) |
|
|
81Se | 80.9179925 (22) |
| 18.45 | m | -76,389.5 (2) | 8,686.01 (2.5) | B- | 100 |
82Se | 81.9166994 (22) | 8.73 (22) | 97 | Ey | -77,594.0 (2) | 8,693.20 (2.5) |
|
|
83Se | 82.9191185 (39) |
| 22.3 | m | -75,340.7 (3.6) | 8,658.56 (4.4) | B- | 100 |
84Se | 83.918462 (16) |
| 3.1 | m | -75,952 (15) | 8,658.8 (1.7) | B- | 100 |
85Se | 84.922245 (32) |
| 31.7 | s | -72,428 (30) | 8,610.5 (3.5) | B- | 100 |
86Se | 85.924272 (17) |
| 15.3 | s | -70,541 (16) | 8,582.3 (1.8) | B- | 100 |
87Se | 86.928521 (42) |
| 5.5 | s | -66,582 (39) | 8,530.9 (4.5) | B- | 100 |
88Se | 87.931424 (53) |
| 1.53 | s | -63,878 (49) | 8,494.9 (5.6) | B- | 100 |
89Se | 88.93645 (32) |
| 410 | ms | -59,200 (300) | 8,438 (3) | B- | 100 |
90Se | 89.93996 (43) |
| 300 | ms | -55,930 (400) | 8,397 (4) | B- ? |
|
91Se | 90.94596 (54) |
| 270 | ms | -50,340 (500) | 8,332 (6) | B- | 100 |
92Se | 91.94992 (64) |
| 100 | ms | -46,650 (600) | 8,289 (6) | B- ? |
|
93Se | 92.95629 (86) |
| 50 | ms | -40,720 (800) | 8,223 (9) | B- ? |
|
94Se | 93.96049 (86) |
| 20 | ms | -36,800 (800) | 8,180 (9) | B- ? |
|
69mSe | 68.939558 (37) |
| 2 | us | -56,302 (34) | 8,501.8 (5) | IT | 100 |
71mSe | 70.932242 (34) |
| 5.6 | us | -63,116 (32) | 8,585.6 (4.4) | IT | 100 |
73mSe | 72.926765 (11) |
| 39.8 | m | -68,218 (11) | 8,641.4 (1.5) | IT | 72.6 3 |
77mSe | 76.9199140 (18) |
| 17.36 | s | -74,599.6 (1.7) | 8,694.69 (2.1) | IT | 100 |
79mSe | 78.9184991 (18) |
| 3.92 | m | -75,917.6 (1.7) | 8,695.59 (2.1) | IT~100 |
|
81mSe | 80.9179925 (22) |
| 57.28 | m | -76,389.5 (2) | 8,686.01 (2.5) | IT~100 |
|
83mSe | 82.9191185 (39) |
| 70.1 | s | -75,340.7 (3.6) | 8,658.56 (4.4) | B- | 100 |
69m1Se | 68.939558 (37) |
| 955 | ns | -56,302 (34) | 8,501.8 (5) | IT | 100 |
71m1Se | 70.932242 (34) |
| 19 | us | -63,116 (32) | 8,585.6 (4.4) | IT | 100 |
Data Source: ENSDF March 2005
©Radiochemistry Society 2005