If ...

Hypothetically, if:

... potassium iodide, abundant in kelp, helps ward off the lurgies of nuclear contamination
... and if most of the West's supply of kelp comes from Japan
... and if Japan is contaminated by nuke fallout from its reactor explosions
... and if we buy kelp to help ward off those lurgies ...

... will we succeed?

Or will that kelp itself be radioactive?