[AnIdiotOnTheNet]

Actually "haunted" locations are often linked to carbon monoxide and infrasound, IIRC. We generally don't blame ghosts for mysterious burns or other signs of radiation sickness.

[undersuit]

We don't, but a society that doesn't know about radiation or even elementary particles may.

The village doctor in the 1500s diagnosing radiation sickness would be even more of a quack than the one that doesn't apply enough leeches.