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← ScienceWhich material outcome occurs during sustained nuclear fission?
A)Neutron captures increase dramatically✓
B)Moderator efficiency spontaneously decreases
C)Criticality spontaneously decays over time
D)Binding energy gradually becomes unstable
💡 Explanation
Neutron absorption cross-sections increase during fuel burn-up because accumulating fission byproducts like Xenon-135 readily capture neutrons. Therefore, neutron captures rise, rather than the criticality decaying, because reaction rates need not decrease.
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