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Titan9312 t1_j0xzoay wrote

There are certain types of fungi that glow. They almost look like the radioactive trope you’re looking for.

Radiation mutates the cells of a living organism. Perhaps you can have a side effect of cell mutation result in a glow.

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Local_Seaweed_9610 t1_j0yl0d4 wrote

I think this might be a great solution for OP. Somehow they don't die of the radiation (highly fictional), but their mutating cells (which does happen when exposed) do cause a glow that just isn't really a thing as OP describes it. Just gotta learn the basics of mutations as described by real Biology a bit and add some weird fictional protein/amino-acid that "turns on" and makes the fictional character glow, making it clear they have been exposed. So many places you could go to from that

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