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Which risk increases when enriched uranium isotopes accumulate impurities?

A)Chain reaction criticality decreases
B)Neutron moderation efficiency declines
C)Spontaneous fission event probability rises
D)Gamma radiation shielding becomes insufficient

💡 Explanation

Spontaneous fission probability increases because impurities introduce additional reaction pathways destabilizing the nucleus, triggering decays more easily; therefore the chance of a nuclear event rises above design, rather than being stable.

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