Bear in mind that your body always contains potassium (mostly non-radioactive, but a tiny bit is radioactive). Eating a banana just slightly increases your exp

Bear in mind that your body always contains potassium (mostly non-radioactive, but a tiny bit is radioactive). Eating a banana just slightly increases your exposure for a short time. If we take a look at our handy dandy xkcd radiation chart[1], we can see that eating a banana every day for a year exposes you to about 36.5 uSv radiation, slightly less than you get during a six hour airline flight. By comparison, the potassium naturally contained in your body already exposes you to 390 uSv radiation in a year. [1]: http://xkcd.com/radiation/ http://xkcd.com/radiation/