That shelter involves taking storage and waste bags in the spacecraft and creating “a little pillow fort,” said Rob Chambers of Lockheed Martin, prime contractor for Orion. The four astronauts would then huddle inside, pressed against one another until the storm subsides.
Sounds cozy :)
Later missions, though, may have more protection. The uncrewed Artemis 1 mission tested AstroRad, a vest designed to protect the torso from solar protons. One manikin, instrumented with radiation detectors, wore the vest, while an identical one did not. “It worked better than expected the first time out,” he said, reducing the effective radiation dose by 40% to 61%.
What did they do for the Apollo missions? Did they just risk it with minimal protection? It was the '60s after all...