In an emergency, if no more KI tablets available here, you can topically (on the skin) apply an iodine solution, like tincture of iodine or Betadine, for a similar protective effect. (WARNING: Iodine is NEVER to be ingested or swallowed, it is poison to drink.)

For adults, paint 8 ml of a 2 percent tincture of Iodine on the abdomen or forearm each day, ideally at least 2 hours prior to initial exposure. For children 3 to 18, but under 150 pounds, only half that amount painted on daily, or 4 ml.

[link to afabwint.ning.com]