"Certain isotopes of potassium are naturally radioactive. Most radiation is harmless. That's why you don't die from eating microwaved foods or using cellphones or computers. The type of radiation that is harmful though is ionizing radiation, the radiation that rips electrons apart from neighboring atoms. Ionizing radiation is measured in a scale known as the sievert scale. If you were, at once, exposed to more than 2 sieverts of radiation, you would die shortly after. Bananas contain only about .1 microsieverts though, so they're not that radioactive. You would need to eat over 2,000,000 bananas in a short amount of time to actually die of radiation poisoning.. And you would die way earlier due to food overdose or food poisoning. "
This doesn't answer the question as to why they help to take them if nuclear war is imminent
they recommended it a lot in cold war
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