Updated September 2026, 1 week ago

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$Bananas are Radioactive! So How Many Can You Safely Eat? Bananas are naturally radioactive because they contain potassium, including a small fraction (about 0.012%) of the radioactive isotope potassium-40. This isotope decays very slowly over billions of years, emitting low levels of beta particles and gamma rays. A typical banana provides roughly 450 mg of potassium, resulting in about 15 radioactive decays per second from potassium-40. The radiation dose from eating one banana is extremely small, around 0.1 microsieverts, known as the Banana Equivalent Dose. This amount represents only about 1% of a persons average daily background radiation exposure and is far less than the dose from a single chest X-ray. Consuming an impossibly large number of bananas—millions at once—would be required to reach a dangerous radiation level, so bananas remain perfectly safe and healthy to eat.$

Math and Science |