4. Potassium Iodide Administration 

In case you have ingested the radioactive iodine in the body (internal exposure),  It is important to take the potassium iodide distributed in a shelter only as instructed.When potassium iodide is taken before or immediately after the radioactive iodine ingestion,it can prevent or reduce the influence of radioactive iodine at the thyroid due to the competitive nature of these iodine products.However, there is a possibility of side effects such as allergic reaction by taking potassium iodide.In addition, potassium iodide is only effective when radioactive iodine enters into the body.There is no effect for external contamination. In conclusion, any necessity of potassium iodide should be determined by a trained medical professional.(Please refer to the separate information regarding iodine intake.)