Iodine supplements are a good item to have in case you have any exposure to radioactive fallout. Ten's of thousands of children and young adults have lost their thyroid glands due to being exposed to nuclear fallout and not taking this supplement. Sadly I saw quite a few in the following years after Chernobyl.

Red Wine and Seaweed are both also reputed to help the body deal with and expel other radioactive contamination in the body different than radioactive Iodine. For those exposed, having Iodine supplements at least allows the victim to do something to minimize the damage.