He says about 95% of the population of the US is iodine deficient, so if/when radioactive iodine arrives from Japan, it will be readily absorbed because of the deficiency.
Even if it turns out that the radioactive iodine levels do not go up, almost almost everyone should be getting 100's of times more than they are currently getting, just to maintain good health.
As far as acquiring iodine if you don't already have a good supply, chances you will have extreme difficulty in buying it now. The reputable sellers on ebay are cleaned out or backlogged and the new sellers who are arriving in droves are asking super high prices (the free market in action).
"Bend over and grab your ankles" should be etched in stone at the entrance to every government building and every government office.