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Long-lived fission products
v
t
e
Nuclide
t
1
⁄
2
Yield
Q
[a 1]
βγ
(
Ma
)
(%)
[a 2]
(
keV
)
99
Tc
0.211
6.1385
294
β
126
Sn
0.230
0.1084
4050
[a 3]
β
γ
79
Se
0.327
0.0447
151
β
135
Cs
1.33
6.9110
[a 4]
269
β
93
Zr
1.53
5.4575
91
βγ
107
Pd
6.5
1.2499
33
β
129
I
15.7
0.8410
194
βγ
^
Decay energy is split among
β
,
neutrino
, and
γ
if any.
^
Per 65 thermal neutron fissions of
235
U
and 35 of
239
Pu
.
^
Has decay energy 380 keV, but its decay product
126
Sb has decay energy 3.67 MeV.
^
Lower in thermal reactors because
135
Xe
, its predecessor,
readily absorbs neutrons
.
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