Power Plant Engineering
A moderator, apart from its high neutron slowing power, and low non-productive neutron, should be

Stable under nuclear radiation
All of the listed here
Corrosion resistant
Good thermal conductor

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Power Plant Engineering
Natural uranium is made up of

99.282% U₂₃₈, 0.712% U₂₃₅, 0.006% U₂₃₄
99.282% U₂₃₅, 0.712% U₂₃₄, 0.006% U₂₃₈
99.282% U₂₃₅, 0.712% U₂₃₈, 0.06%' U₂₃₄
99.282% U₂₃₄, 0.712% U₂₃₈, 0.006% U₂₃₅

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