Actinides and fission products by half-life
|Actinides by decay chain||Half-life
|Fission products by yield|
|228Ra№||4 – 6||†||155Euþ|
|244Cm||241Puƒ||250Cf||227Ac№||10 – 29||90Sr||85Kr||113mCdþ|
|232Uƒ||238Pu||243Cmƒ||29 – 97||137Cs||151Smþ||121mSn|
|249Cfƒ||242mAmƒ||141 – 351||
No fission products
|241Am||251Cfƒ||430 – 900|
|226Ra№||247Bk||1.3k – 1.6k|
|240Pu||229Th||246Cm||243Am||4.7k – 7.4k|
|245Cmƒ||250Cm||8.3k – 8.5k|
|230Th№||231Pa№||32k – 76k|
|236Npƒ||233Uƒ||234U№||150k – 250k||‡||99Tc₡||126Sn|
|248Cm||242Pu||327k – 375k||79Se₡|
|237Np||2.15M – 6.5M||135Cs₡||107Pd|
|236U||247Cmƒ||15M – 24M||129I₡|
...nor beyond 15.7M
|232Th№||238U№||235Uƒ№||0.7G – 14G|
Legend for superscript symbols used:
- 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 isotopes have half-lives of at least four years (the longest-lived isotope in the gap is radon-222 with a half life of less than four days). Radium's longest lived isotope, at a notable 1600 years, thus merits the element's inclusion here.
- Specifically from thermal neutron fission of U-235, e.g. in a typical nuclear reactor.
- This is the heaviest isotope with a half-life of at least four years before the "Sea of Instability".
- Excluding those 'classically stable' isotopes 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.
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