You would probably hit other problems with eating that many bananas before you got close to problematic levels. It's more useful for things like "living within

You would probably hit other problems with eating that many bananas before you got close to problematic levels. It's more useful for things like "living within 50 miles of a nuclear power plant for a year (0.3 µSv) is the equivalent of eating 3 bananas (0.1 µSv each)." Relevant xkcd - https://xkcd.com/radiation/ https://xkcd.com/radiation/ Note also the "Yearly dose from natural potassium in the body 390 µSv"