STRINGS.CODEX.RADIATION.PARAGRAPH_2
Duplicants who are exposed to Radioactive Contaminants will need to wear protection or they risk coming down with Radiation Sickness.
Some Duplicants will have more of a natural resistance to radiation, but prolonged exposure will still increase their chances of becoming sick.
Consuming Rad Pills or seafood such as Cooked Seafood or Waterweed increases a Duplicant's radiation resistance, but will not cure a Duplicant's Radiation Sickness once they have become infected.
On the other hand, exposure to radiation will kill Food Poisoning, Slimelung and Zombie Spores on surfaces (including on Duplicants).