Comment by bell-cot
14 hours ago
> Cosmic ray radiation is unpredictable, high-energy, and is ...
IIR, the big problem is that the cosmic ray background radiation is far too predictable - there is a concerning amount of it 24x7x365. So your baseline choices are gritting your teeth and bearing it, or spending most of your time in a seriously hard shelter.
Definitely outside my realm of expertise, but I'd expect that particles have a range of energies, and that the most energetic, or most damaging (not necessarily the same) occur somewhat rarely.
But yes, generally, it's at the very least a constant background flux (with occasional peaks), and all of it high-energy enough to make lightweight shielding of limited use.