Table 1 Initial and final isotope compositions of LLFPs in the system.

From: Method to Reduce Long-lived Fission Products by Nuclear Transmutations with Fast Spectrum Reactors

Element Isotope Initial composition (%) Final composition (%)
Se 76Se 0.027 0.016
77Se 2.786 1.12
78Se 5.587 6.49
79Se 13.32 4.75
80Se 22.75 31.00
82Se 55.52 54.89
Tc 99Tc 100.00 72.93
Pd 104Pd 2.93 2.62
105Pd 35.14 21.64
106Pd 17.86 30.36
107Pd 21.72 14.92
108Pd 17.12 25.49
110Pd 5.24 4.97
Zr 90Zr 0.27 0.41
91Zr 11.72 10.80
92Zr 16.11 16.76
92Zr 19.95 17.84
94Zr 22.33 24.53
95Zr 3.04 0.0026
96Zr 26.59 26.06
I 127I 23.91 6.03
129I 76.09 42.82
Cs 133Cs 31.40 14.9
134Cs 1.52 0.10
135Cs 35.21 7.22
136Cs 0.05 2.9 × 10−14
137Cs 31.82 3.45
  1. Initial compositions based on the burn-up simulations of MOX fuel by a fast breeder reactor core at 80 GWd/t for 2 years and final compositions after 20 years of irradiation in this study by MVP-BURN.