What is Potassium Iodide (KI)?

What is Potassium Iodide (KI)?

Potassium Iodide (chemical name 'KI') is much more familiar to most than they might first expect. It is the ingredient added to your table salt to make it iodized salt.
Potassium iodide is a special kind of protective measure in that it offers very specialized protection. Potassium iodide protects the thyroid gland against internal uptake of radioiodines that may be released in the unlikely event of a nuclear reactor accident.

Potassium Iodide (KI) is approximately 76.5% iodine.

For purposes of radiation protection the Nuclear Regulatory Commission (NRC) states in COMSECY-98-016 - FEDERAL REGISTER NOTICE ON POTASSIUM IODIDE:

"In 1978, the U.S. Food and Drug Administration found KI "safe and effective" for use in radiological emergencies and approved its over-the-counter sale."

Most recently (November, 2001) the FDA states in Potassium Iodide as a Thyroid Blocking Agent in Radiation Emergencies:

"FDA maintains that KI is a safe and effective means by which to prevent radioiodine uptake by the thyroid gland, under certain specified conditions of use, and thereby obviate the risk of thyroid cancer in the event of a radiation emergency."


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