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Bananas are slightly radioactive
Bananas contain a tiny amount of naturally radioactive potassium-40 along with ordinary potassium.
Why it is true
Potassium is essential to living cells, and a small fraction of natural potassium is the radioactive isotope potassium-40. The dose from eating a banana is extremely small and not a health concern.
Check the source
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Open U.S. Environmental Protection Agency
