Bananas are a very healthy fruit containing lots of vitamins like potassium, vitamin c, vitamin a, vitamin e and vitamin k, but did you know that bananas are slightly radioactive? Bananas contain high amounts of potassium-40, a naturally occurring isotope of potassium that emits beta and gamma radiation. The amount of radiation that bananas emit is so small that you would have to eat 10 million bananas in one sitting to get a lethal dose of radiation. I decided to see how much radiation they emit by placing a Geiger counter next to a pan of banana bread.

The Geiger counter is reading 0.17 microsieverts per hour of radiation. The most radioactive spot at Chernobyl was emitting 300 sieverts per hour, or 300 million microsieverts per hour, of radiation in 1986, soon after the disaster, which will provide a lethal dose in one minute.