Bananas, though radioactive due to potassium-40, don't pose health risks. The radiation from one banana is minimal compared to daily exposure from various sources. Interestingly, humans are more radioactive than bananas due to naturally occurring potassium in our bodies. Several other foods also contain radioactive isotopes, but their levels are safe for consumption.Bananas, though radioactive due to potassium-40, don't pose health risks. The radiation from one banana is minimal compared to daily exposure from various sources. Interestingly, humans are more radioactive than bananas due to naturally occurring potassium in our bodies. Several other foods also contain radioactive isotopes, but their levels are safe for consumption.