How dangerous is potassium-40 in bananas? If we talk about the dose of radiation, then with the use of one banana, it is approximately 0.0778 microsieverts. This is very small. And 35 million bananas contain a lethal dose of radiation.
We must not forget about the work of metabolism in the body. Even if you eat a lot of bananas, the excess potassium will still be excreted from the body.