Polaria said:
Daemon creates gamma radiation and radiates the super structure of space ship, causing it to turn radioactive. Now the originally "impossible" gamma-radiation hjas cause mundane material to become radioactive and emit more gamma rays. Untouchable enters the ship, becomes radiated...
But that's not Corruption (largely, the taint of Chaos and the Immaterium), but corruption (entirely mundane, as denoted by being spelt with a lower-case 'c'). Mutation isn't solely or specifically a warp-based thing - mutants are born all across the Imperium due to inbreeding, genetic defects, pollution and a variety of entirely mundane reasons. Similarly, radiation is not a thing of the Warp, and its effects are not those of Corruption.