Bananas are naturally radioactive — every banana carries a tiny amount of potassium-40, a radioactive isotope. In this video you learn: what potassium-40 is and why it makes bananas faintly radioactive; what the banana equivalent dose means (one banana is about a tenth of a microsievert); and why eating more bananas does not make you more radioactive, because your kidneys keep your potassium level steady.
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