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Isotopes of Tungsten
Natural tungsten contains five stable isotopes. Twenty one other unstable isotopes are recognized.
| Natural Abun. (%) |
Atomic Mass |
Half- life |
Decay Mode /Energy (/MeV) |
Part. En. /Intensity (MeV/%) |
Cross-sect. Ther. Neut. (b) |
Spin (h/2 pi) |
Magnetic Dipl.Mom. (nm) |
Electric Quad. Mom. (b) |
Gamma En. /Intensity (MeV/%) |
|
| 158W | 157.97383 | 0.9ms | alpha | |||||||
| 159W | 158.97239 | 7ms | alpha | |||||||
| 160W | 159.94848 | 0.08s | alpha | 5.92 | 0+ | |||||
| 161W | 160.94714 | 0.41s | ?+,E.C./ 8.4 alpha |
5.78 |
||||||
| 162W | 161.96329 | 1.39s | ?+,E.C./ 5.8 alpha |
5.54 |
0+ | |||||
| 163W | 162.96227 | 2.8s | ?+,E.C./ 7.5 alpha |
5.38 |
||||||
| 164W | 163.95882 | 6s | ?+,E.C./ 4.9 alpha |
5.15 |
0+ | rad. an. | ||||
| 165W | 164.95811 | 5.1s | ?+,E.C./ 6.8 alpha |
4.91 |
rad. an. | |||||
| 166W | 165.95502 | 16s | ?+,E.C./ 4.4 alpha |
4.74 |
0+ | rad. an. | ||||
| 167W | 166.95454 | 20s | E.C./ 6.1 | |||||||
| 168W | 167.95186 | 53s | E.C./ 3.7 | |||||||
| 169W | 168.95175 | 1.3m | E.C./ 5.4 | |||||||
| 170W | 169.94929 | 2.4m | E.C./ 3 | |||||||
| 171W | 170.94946 | 2.4m | E.C./ 4.6 | |||||||
| 172W | 171.94743 | 6.6m | ?+,E.C./ 2.5 | 0.0359 0.1302 0.4576 0.6236 |
||||||
| 173W | 172.94771 | 6.3m | E.C./ 3.8 | 0.0499 0.1057 0.3652 0.707 |
||||||
| 174W | 173.94616 | 35m | E.C./ 1.7 | 0+ | 0.0354 0.3287 0.4288 |
|||||
| 175W | 174.94677 | 35m | E.C./ 2.9 | 1/2- | 0.015 - 0.27 | |||||
| 176W | 175.94559 | 2.5h | ?+,E.C./ 0.8 | 0+ | 0.03358 0.06129 0.09487 0.1002 |
|||||
| 177W | 176.94661 | 2.21h | E.C./ 2 | 1/2- | Ta k x rays 0.15505 0.18569 0.42694 |
|||||
| 178W | 177.94584 | 21.6d | E.C./ 0.09 | 0+ | Ta k x rays | |||||
| 179mW | 6.4m | I.T./ 0.222 E.C. |
1/2- | W k x rays 0.222 |
||||||
| 179W | 178.947067 | 38m | E.C./ 1.06 | 7/2- | Ta k x rays 0.0307 |
|||||
| 180W | 0.12 % | 179.946701 | 4 b | 0+ | ||||||
| 181W | 180.948192 | 121.2d | E.C./ 0.19 | 9/2+ | Ta k x rays 0.13617 0.15221 |
|||||
| 182W | 26.3 % | 181.948202 | 20 b | 0+ | ||||||
| 183mW | 5.15s | I.T. | 11/2+ | W k x rays 0.0465 0.0526 0.0991 0.1605 |
||||||
| 183W | 14.28 % | 182.95022 | 10.5 b | 1/2- | 0.11778 nm | |||||
| 184W | 30.7 % | 183.950928 | 2 b | 0+ | ||||||
| 185mW | 1.6m | I.T./ 0.1974 | 11/2+ | W k x rays 0.0659 0.1315 0.1737 |
||||||
| 185W | 184.953416 | 74.8d | ?-/ 0.433 | 0.433/ 99.9 | 3.3 b | 3/2- | 0.12536 | |||
| 186W | 28.6 % | 185.954357 | 36 b | 0+ | ||||||
| 187W | 186.957153 | 23.9h | ?-/ 1.312 | 0.624 1.315 |
70 b | 3/2- | 0.62 nm | Re k x rays 0.0725 0.47951 0.68572 |
||
| 188W | 187.95848 | 69.4d | ?-/ 0.349 | 0.349/ 99 | 0+ | 0.0636 0.2271 0.2907 |
||||
| 189W | 188.9619 | 11.5m | ?-/ 2.5 | 1.4 2.5 |
3/2- | 0.258 0.417 0.55 |
||||
| 190W | 189.96321 | 30m | ?-/ 1.3 | 0.95 | 0+ | Re k x rays 0.1576 0.1621 |
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