Will taking iodine supplements protect my thyroid against radiation poisoning?

There is quite a bit of confusion lately about iodine supplements lately. I don't know who to ask about it, because there is so much conflicting information. I've heard that iodine deficiency can cause chronic fatigue and other thyroid problems, and that with radiation from Japan in the atomosphere I should be taking it, but others say not. Where can I get reliable information about it?