Ordered By Yield (thermal Neutron Fission of U-235)
Yield | Isotope | Halflife | Comment |
---|---|---|---|
6.7896% | caesium-133 133Cs → 134Cs | 7000200000000000000 2.065 y | neutron capture (29 barns) slowly converts stable 133Cs to 134Cs, which itself is low-yield because beta decay stops at 134Xe; can be further converted (140 barns) to 135Cs |
6.3333% | iodine1-35 135I → 135Xe | 6996599999999900000 6.57 h | most important neutron poison; neutron capture converts 10%–50% of 135Xe to 136Xe; remainder decays (9.14h) to 135Cs (2.3My) |
6.2956% | zirconium 93Zr | 7006153000000000000 1.53 My | |
6.1% | molybdenum 99Mo | 6997300000000000000 65.94 h | Its daughter nuclide 99mTc is important in medical diagnosing. |
6.0899% | caesium-137 137Cs | 7001300000000000000 30.17 y | |
6.0507% | technetium 99Tc | 7005211000000000000 211 ky | Candidate for disposal by nuclear transmutation |
5.7518% | strontium 90Sr | 7001290000000000000 28.9 y | |
2.8336% | iodine131 131I | 6997800000000000000 8.02 d | |
2.2713% | promethium 147Pm | 7000260000000000000 2.62 y | |
1.0888% | samarium-149 149Sm | 7008100000000000000 virtually stable | 2nd most significant neutron poison |
0.6576% | iodine-129 129I | 7007157000000000000 15.7 My | Candidate for disposal by nuclear transmutation |
0.4203% | samarium-151 151Sm | 7001900000000000000 90 y | neutron poison; most will be converted to stable 152Sm |
0.3912% | ruthenium 106Ru | 7000100000000000000 373.6 d | |
0.2717% | krypton 85Kr | 7001110000000000000 10.78 y | |
0.1629% | palladium 107Pd | 7006650000000000000 6.5 My | |
0.0508% | selenium 79Se | 7005327000000000000 327 ky | |
0.0330% | europium 155Eu → 155Gd | 7000500000000000000 4.76 y | both neutron poisons, most will be destroyed while fuel still in use |
0.0297% | antimony 125Sb | 7000280000000099999 2.76 y | |
0.0236% | tin 126Sn | 7005230000000000000 230 ky | |
0.0065% | gadolinium 157Gd | 7008100000000000000 stable | neutron poison |
0.0003% | cadmium 113mCd | 7001140000000000000 14.1 y | neutron poison, most will be destroyed while fuel still in use |
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