Ordered By Thermal Neutron Neutron Absorption Cross Section
| Barns | Yield | Isotope | t½ | Comment |
|---|---|---|---|---|
| 70062650000000000002,650,000 | 6.3333% | iodine-135 135I → 135Xe | 6996599999999900000 6.57 h | Most important neutron poison; neutron capture rapidly converts 135Xe to 136Xe; remainder decays (9.14 h) to 135Cs (2.3 My) |
| 7005254000000000000254,000 | 0.0065% | gadolinium 157Gd | ∞ | neutron poison, but low yield |
| 700440140000000000040,140 | 1.0888% | samarium-149 149Sm | ∞ | 2nd most important neutron poison |
| 700420600000000000020,600 | 0.0003% | cadmium 113mCd | 7001140000000000000 14.1 y | most will be destroyed by neutron capture |
| 700415200000000000015,200 | 0.4203% | samarium-151 151Sm | 7001900000000000000 90 y | most will be destroyed by neutron capture |
| 70033950000000000003,950 | 0.0330% | europium 155Eu → 155Gd | 7000500000000000000 4.76 y | both neutron poisons |
| 700196000000000000096 | 2.2713% | promethium 147Pm | 7000260000000000000 2.62 y | |
| 700180000000000000080 | 2.8336% | iodine-131 131I | 6997800000000000000 8.02 d | |
| 700129000000000000029 140 |
6.7896% | caesium-133 133Cs → 134Cs | ∞ 2.065 y |
neutron capture converts a few percent of nonradioactive 133Cs to 134Cs, which has very low direct yield because beta decay stops at 134Xe; further capture will add to long-lived 135Cs |
| 700120000000000000020 | 6.0507% | technetium 99Tc | 7005211000000000000 211 ky | candidate for disposal by nuclear transmutation |
| 700118000000000000018 | 0.6576% | iodine-129 129I | 7007157000000000000 15.7 My | candidate for disposal by nuclear transmutation |
| 70002700000000000002.7 | 6.2956% | zirconium 93Zr | 7006153000000000000 1.53 My | transmutation impractical |
| 70001800000000000001.8 | 0.1629% | palladium 107Pd | 7006650000000000000 6.5 My | |
| 70001660000000000001.66 | 0.2717% | krypton 85Kr | 7001110000000000000 10.78 y | |
| 69999000000000000000.90 | 5.7518% | strontium 90Sr | 7001290000000000000 28.9 y | |
| 69991500000000000000.15 | 0.3912% | ruthenium 106Ru | 7000100000000000000 373.6 d | |
| 69991100000000000000.11 | 6.0899% | caesium-137 137Cs | 7001300000000000000 30.17 y | |
| 0.0297% | antimony 125Sb | 7000270000000000000 2.76 y | ||
| 0.0236% | tin 126Sn | 7005230000000000000 230 ky | ||
| 0.0508% | selenium 79Se | 7005327000000000000 327 ky |
Read more about this topic: Fission Product Yield
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