Fission Product Yield - Ordered By Yield (thermal Neutron Fission of U-235)

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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