> The chief villains of the piece are the Linear No Threshold hypothesis (LNT) and a regulatory standard known as ALARA, or As Low As Reasonably Achievable.

LNT is demonized by people who haven't thought things through.

Without LNT (which is consistent with the evidence), the conservative approach to regulating radiation would be to assume radiation damage is at the maximum level not ruled out by evidence. This would make low dose radiation more damaging than predicted by LNT.

ALARA hinges on what's meant by "reasonably".