Can iodized salt be used to help counter any radiation exposure?

I heard that many people gather iodized salt to prevent counter effect of any radiation exposure with the fear of Japanese nuclear crisis. But in order to achieve WHO recommended  dosage people will need to intake 80 tablespoons would be needed to equal one tablet which is not practical and healthy. So I think it is only myth of people to try iodized salt. In many cities in counties around Japan, there are salt shortage as people try to prevent them with iodized salt. But I think this is not a practical solution as it is not possible to intake required potassium iodide amount iodized salt.