Some years ago I posted indications for use on Iosat, in the event of a radiologic emergency. The concern with Iosat is that some people may think that if you have Iosat, that you are protected from radiation, and this is simply not true. Iosat aid you in the protection of your thyroid in the event of a radiologic emergency of some kind. It does not protect anything else at all. It concerns me that some people may think that simply owning the Iosat in some way protects them from needing to evacuate in such emergencies.
The FDA has released new guidelines for Iosat. I am including the link here. The reality is, that if you need to use Iosat, or your family members do, then you need to evacuate as soon as is reasonably possible.