I've been putting extra, EXTRA salt on my popcorn. lol Okay, on everything...
If it was only that easy (then folks wouldn't be selling tablets for $350.00 per box):
table salt does not contain enough iodine to block radioactive iodine from getting into your thyroid gland. You should not use table salt as a substitute for KI.
I heard sea kelp is a good alternative
Kelp: Supplement the diet with easily assimilable organic iodine, as in kelp (Norwegian or other clean water kelp if possible), this will saturate the thyroid so radioactive iodine will not be absorbed.
http://chemtrailsnorthnz.wordpress.com/2011/03/15/protection-against-radiation-poisoning/
I'm no doctor, but I'd rather take my chances with sea kelp than some of these tablets. "if" we get radiation here, this may be a good alternative (if radiation is in low doses as expected).
Vitamin A, C, E also helps for those who receive radiation treatments:
Radiation reduces tissue antioxidants:
Radiation at doses used in therapy depletes cellular alpha-tocopherol in normal cells, thereby increasing their risk of damage; animal studies show that whole-body exposure to X-ray irradiation decreases tissue concentrations of vitamins C and E (6). A decline in tissue vitamins E and Se during radiation therapy for breast cancer and a fall in vitamins A, C, E, and Se during breast cancer treatment with ROS-producing adriamycine may increase normal tissue sensitivity to radiation damage.
http://jn.nutrition.org/content/134/11/3207S.full
Gotta keep these things in mind if radiation levels increase here in the US.
Hugs,
Mel