Key term for Edexcel GCSE Physics, used in Nuclear Fusion.
A material (like graphite or water) in a nuclear reactor that slows down fast-moving neutrons so they can cause further fission.
Moderator appears in Edexcel GCSE Physics revision content for Radioactivity, especially Nuclear Fusion and Fusion vs Fission.
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Radioactivity
Nuclear Fission • Chain Reaction Principle
