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which can be enriched to produce fuel for the majority of types of reactors". Naturally occurring uranium is made of a mixture of ²³⁵U and ²³⁸U. The ²³⁵U is fissile, meaning it is easily split with neutrons while the remainder is ²³⁸U, but in nature, more than 99% of the extracted ore is ²³⁸U. Most nuclear reactors require enriched uranium, which is uranium with higher concentrations of ²³⁵U ranging between 3.5%

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