Neutrons don't stay dangerous
Free neutrons decay in 15 minutes, while the radioactivity they induce isn't severe in carbon. Most of the worries with neutron activation is with big metal monsters like a tokamak's walls.
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Free neutrons decay in 15 minutes, while the radioactivity they induce isn't severe in carbon. Most of the worries with neutron activation is with big metal monsters like a tokamak's walls.