Radiation protection? What did we use in the 60's? Very good question. No dedicated radiation shielding apart from the aluminium, steel honeycomb and aluminium honeycomb were used in the command module of Apollo 11 for example. The below representation (c) NASA shows the module hull structure:
Command Module Overview - Full detail of thermal and impact protection shielding
This document gives a very good overview of the Apollo 11 Command module shielding system against impact and thermal insulation
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