One way to reduce your risk should you be in the proximity of a nuclear attack is to take Iodide. Potassium iodide is a salt, similar to table salt. Its chemical symbol is KI. It is routinely added to table salt to make it “iodized.” Potassium iodide, if taken in time and at the appropriate dosage, blocks the thyroid gland’s uptake of radioactive iodine and thus could reduce the risk of thyroid cancers and other diseases that might otherwise be caused by exposure to radioactive iodine that could be dispersed in a severe nuclear accident or a nuclear attack.

How to get it?  The FDA has approved potassium iodide as an over-the-counter medication.

For more information go to: https://www.nrc.gov/about-nrc/emerg-preparedness/about-emerg-preparedness/potassium-iodide/ki-faq.html

But it will only protect you if radioactive iodine is present. Local emergency management officials will tell people when to take KI. If a nuclear incident occurs, officials will have to find out which radioactive substances are present before recommending that people take KI. If radioactive iodine is not present, then taking KI will not protect people. If radioactive iodine is present, then taking KI will help protect a person’s thyroid gland from the radioactive iodine. Taking KI will not protect people from other radioactive substances that may be present along with the radioactive iodine.