For charted space? It's not a lot really. Ships are colonies are well enough shielded. Fusion is difficult to give yourself cancer with. EVA is where most of the exposure would be at
Magnetic fields are not particularly good at containing neutrons.
Neutrons striking iron makes Cobalt-60.
In a shutdown reactor, Cobalt-60 is the most significant source of radiation outside of the core's shielding. It takes more than five years for half of that to decay back to iron-59.
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