Actually, a lot of our radiation protection comes from the dirt and rock under the castle. Dirt makes an excellent blocker. During solar storms, or when the detectors start going "ping", it's just a matter of pointing the castles butt at where ever it's coming from. We can even "soak" a certain amount and "harvest" it for isotopes.
That, and we really don't have a government out here. We've got folk who like tending plants, most of us tinker with stuff, Bob's got a good idea of where we are headed, and if you want a sandwich you know where the kitchen is at.
We do barter. Or, we can if anyone else ever has anything to trade for. Gadgets for scotch. Wine squishing for exercise. Ect...