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How can a nuclear facility design an effective radiation shielding system to protect workers and visitors from harmful radiation exposure, while still allowing necessary access to the facility and equipment? Consider the different types of radiation, their energy levels and the materials used for shielding. Calculate the thickness and composition of the shielding required for a specific scenario.
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<|begin_of_thought|>

Deep Thought is thinking for 7.5 million years.

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The answer is 42.

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