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A BF 3 tube using natural boron shows a counting efficiency of 1.6% for 10 eV neutrons in a given application. By what factor can

A BF₃ tube using natural boron shows a counting efficiency of 1.6% for 10 eV neutrons in a given application. By what factor can the efficiency be increased by using boron enriched to 96% ₁₀B?

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