Template:Actinides vs fission products
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Actinides and fission products by half-life
| ||||||||
|---|---|---|---|---|---|---|---|---|
| Actinides[1] by decay chain | Half-life range (y) |
Fission products of 235U by yield<ref>Specifically from thermal neutron fission of U-235, e.g. in a typical nuclear reactor.</ref> | ||||||
| 4n | 4n+1 | 4n+2 | 4n+3 | |||||
| 4.5–7% | 0.04–1.25% | <0.001% | ||||||
| 228Ra№ | 4–6 | † | 155Euþ | |||||
| 244Cmƒ | 241Puƒ | 250Cf | 227Ac№ | 10–29 | 90Sr | 85Kr | 113mCdþ | |
| 232Uƒ | 238Puƒ | 243Cmƒ | 29–97 | 137Cs | 151Smþ | 121mSn | ||
| 248Bk[2] | 249Cfƒ | 242mAmƒ | 141–351 |
No fission products | ||||
| 241Amƒ | 251Cfƒ[3] | 430–900 | ||||||
| 226Ra№ | 247Bk | 1.3 k – 1.6 k | ||||||
| 240Pu | 229Th | 246Cmƒ | 243Amƒ | 4.7 k – 7.4 k | ||||
| 245Cmƒ | 250Cm | 8.3 k – 8.5 k | ||||||
| 239Puƒ | 24.1 k | |||||||
| 230Th№ | 231Pa№ | 32 k – 76 k | ||||||
| 236Npƒ | 233Uƒ | 234U№ | 150 k – 250 k | ‡ | 99Tc₡ | 126Sn | ||
| 248Cm | 242Pu | 327 k – 375 k | 79Se₡ | |||||
| 1.53 M | 93Zr | |||||||
| 237Npƒ | 2.1 M – 6.5 M | 135Cs₡ | 107Pd | |||||
| 236U | 247Cmƒ | 15 M – 24 M | 129I₡ | |||||
| 244Pu | 80 M |
... nor beyond 15.7 M years[4] | ||||||
| 232Th№ | 238U№ | 235Uƒ№ | 0.7 G – 14.1 G | |||||
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Legend for superscript symbols | ||||||||
References
- ↑ Plus radium (element 88). While actually a sub-actinide, it immediately precedes actinium (89) and follows a three-element gap of instability after polonium (84) where no nuclides have half-lives of at least four years (the longest-lived nuclide in the gap is radon-222 with a half life of less than four days). Radium's longest lived isotope, at 1,600 years, thus merits the element's inclusion here.
- ↑ Milsted, J.; Friedman, A. M.; Stevens, C. M. (1965). "The alpha half-life of berkelium-247; a new long-lived isomer of berkelium-248". Nuclear Physics 71 (2): 299. doi:10.1016/0029-5582(65)90719-4. Bibcode: 1965NucPh..71..299M.
"The isotopic analyses disclosed a species of mass 248 in constant abundance in three samples analysed over a period of about 10 months. This was ascribed to an isomer of Bk248 with a half-life greater than 9 y. No growth of Cf248 was detected, and a lower limit for the β− half-life can be set at about 104 y. No alpha activity attributable to the new isomer has been detected; the alpha half-life is probably greater than 300 y." - ↑ This is the heaviest nuclide with a half-life of at least four years before the "Sea of Instability".
- ↑ Excluding those "classically stable" nuclides with half-lives significantly in excess of 232Th; e.g., while 113mCd has a half-life of only fourteen years, that of 113Cd is nearly eight quadrillion years.
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