Ordered By Halflife
| Yield | Isotope | Halflife | Comment |
|---|---|---|---|
| 2.8336% | 131I | 8.02d | Important in nuclear explosions and accidents but not in cooled spent nuclear fuel |
| 0.3912% | 106Ru | 373.6d | |
| 6.7896% | 133Cs → 134Cs | 2.065y | neutron capture converts a few percent of nonradioactive 133Cs to 134Cs, which has low direct yield because beta decay stops at 134Xe |
| 2.2713% | 147Pm | 2.62y | |
| 0.0297% | 125Sb | 2.76y | |
| <0.0330% | 155Eu → 155Gd | 4.76y | both neutron poisons, most will be destroyed by neutron capture while still in reactor |
| 0.2717% | 85Kr | 10.78y | Current nuclear reprocessing releases it to atmosphere |
| <0.0003% | 113mCd | 14.1y | most will be destroyed by neutron capture while still in reactor |
| 5.7518% | 90Sr | 28.9y | One of two principal medium-term radiation and heat sources |
| 6.0899% | 137Cs | 30.17y | One of two principal medium-term radiation and heat sources |
| <0.4203% | 151Sm | 90y | Most will be destroyed by neutron capture while still in reactor |
| 6.0507% | 99Tc | 211ky | Dominant radiation source among FP in period about ×104 to ×106 years; mobile in environment; candidate for disposal by nuclear transmutation |
| 0.0236% | 126Sn | 230ky | |
| 0.0508% | 79Se | 327ky | |
| 6.2956% | 93Zr | 1.53My | |
| <6.3333% | 135Cs | 2.3My | |
| 0.1629% | 107Pd | 6.5My | |
| 0.6576% | 129I | 15.7My | Mobile in environment; candidate for disposal by nuclear transmutation |
| <1.0888% | 149Sm | nonradioactive | neutron poison |
| <0.0065% | 157Gd | nonradioactive | neutron poison |
Read more about this topic: Fission Product Yield
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