Send a comment on this item to LII: Send a comment on this item to LII staff, who on weekdays will usually reply within 24 hours. Guidance: Potassium Iodide as a Thyroid Blocking Agent in Radiation Emergencies This site from the U.S. Food and Drug Administration provides information "regarding the safe and effective use of potassium iodide (KI) as an adjunct to other public health protective measures in the event that radioactive iodine is released into the environment." The report points out that "evacuation, sheltering, and control of contaminated foodstuffs" are even more crucial prevention measures (aside from not exploding radioactive devices in the first place). Opens directly into a PDF file. http://www.fda.gov/downloads/Drugs/GuidanceComplianceRegulatoryInformation/Guidances/ucm080542.pdf Asterisk * indicates required field. Your Name Your Email Address * We will not sell or provide your email address to anyone else. Comment * Enter the verification code as it is shown in the box below. This helps prevent automated submissions. *