this is exactly what i said in my original comment.

I looked up competing LNT models. TIL about radiation hormesis. theoretically, near-zero but >0 levels of radiation activate dormant repair mechanisms that not only repair radiation damage, but also non-radiation damage; this results in a healthier host. interesting.

having thought about this for all of 30 seconds, i wonder if both models arent simultaneously correct. if most radiation damage is repairable, activating dormant repair mechanisms with tiny amounts of radiation would be a net benefit. however, if there exists any possible irrepairable damage in any cell anywhere on your body regardless of otherwise functioning repair processes - which i dont know to be true but seems likely - then LNT could also be true concurrently with radiation hormesis.