Nuclear Survival FAQ
Answers to the most common questions about nuclear preparedness, radiation safety, and survival. All answers are based on official FEMA, CDC, and IAEA guidance.
Can you survive a nuclear attack?
Yes. The majority of people who are not in the immediate blast zone can significantly improve their chances of survival by taking the right actions. According to FEMA, getting inside a substantial building quickly, moving to the center away from windows, and staying put for at least 24 hours are the three most important survival actions.
How long do you need to stay in a fallout shelter?
According to FEMA, you should stay inside your shelter for at least 24 hours, and ideally 48 hours. Radiation decays rapidly following the 7:10 Rule: for every 7-fold increase in time, radiation decreases by a factor of 10. Always wait for official instructions before leaving your shelter.
What is Acute Radiation Sickness (ARS)?
ARS occurs when the body is exposed to a high dose of penetrating radiation over a short period. According to the CDC, ARS has three stages: the prodromal stage (nausea, vomiting), the latent stage (apparent recovery), and the manifest illness stage (severe symptoms). The best prevention is effective sheltering.
Does potassium iodide (KI) protect against radiation?
KI protects only the thyroid gland from radioactive iodine (I-131). It does not protect against other types of radiation. The CDC recommends KI only when specifically directed by public health officials. It is not a general-purpose radiation antidote and should not replace sheltering.
Which countries have nuclear weapons?
Nine countries are known or believed to possess nuclear weapons: the United States, Russia, China, France, the United Kingdom, Pakistan, India, Israel, and North Korea. The US and Russia hold the vast majority of the global nuclear arsenal.
All answers based on: FEMA Ready.gov, CDC Radiation Emergencies, IAEA Emergency Preparedness.