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> 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.

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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.

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