What is the suggested minimum depth for burying habitats for initial protection against radiation?

Answer

At least a 2-meter thick layer of compacted lunar regolith

Initial proposals for safeguarding against the continuous stream of solar and galactic radiation mandate burying permanent habitats under a layer of compacted lunar regolith that is at least 2 meters thick.

What is the suggested minimum depth for burying habitats for initial protection against radiation?

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