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In this case, iron and silicon films are used, mixed with isotopic enriched boron carbide.

The improved mirror has been developed by researchers at Linköping University by coating a silicon plate with extremely thin layers of iron and silicon mixed with boron carbide.

For example, the ceramic plates fitted into body armour are becoming better, with newer versions using materials such as boron carbide.

The rods contained boron carbide, which hampered reactivity, but the Soviets decided to tip them in graphite, which facilitated reactivity; it was a bid to save energy, and therefore money, by lessening the rods’ moderating effect.

They inserted the control rods—graphite-tipped cylinders of boron carbide that slow or stop a nuclear reaction—too far into the reactor.