Iodine tablets are used to get certain isotopes out of your body - and they are very effective at doing so. They in no way increase your resistance to ionizing radiation or its effects on your body outside the digestive tract. If you are exposed to direct radiation it won't do anything for that other than make you emotionally feel better. Fallout is not particularly bad as long as you can shower and clean your clothes. Strontium 90 is a real danger and it comes from exposure to foods from metal containers that have been exposed to direct and indirect radiation. Unfortunately your iodine tabs won't help in that situation.
Best thing is to keep a minimum of 2 feet - 200 pounds per square foot - of dirt or sand between you and any radiation primary source. With air burst bombs you need to stay sheltered for three days - especially if it rains during that time.
Best thing is to keep a minimum of 2 feet - 200 pounds per square foot - of dirt or sand between you and any radiation primary source. With air burst bombs you need to stay sheltered for three days - especially if it rains during that time.
