Your average banana is about 150 cubic cm, but that’s too complicated for the math I want to do, and once its masticated you can put it in a smaller space so let’s just call it 100 cm^3. Eating a banana gives you a radiation dose of about 0.1 microsieverts, so ten bananas, or a thousand cubic centimeters of banana in your stomach, would give you one microsievert of radiation. The thing about radiation, is that it won’t kill you very much until you’ve gotten a lot of it, the maximum amount of radiation that astronauts are allowed to take in over their life is 1 sievert, which is the same as if you ate ten million bananas. In fact, even that doesn’t represent a significant danger to them because radiation is most deadly when it happens all at once, so a dose of about 4 sieverts is potentially fatal if it happens all at once, but the highest known non-fatal dose was around 64 sieverts administered (in deeply unethical circumstances) over 21 years, so if you ate about forty million bananas all at once you’d get a potentially lethal dose, but if you had eight thousand bananas for breakfast each morning you could survive the radiation.
Now, I’m an astrophysicist not a biologist, so people who actually know things will have to forgive me when I say that the human stomach is probably not bigger than a 10x10x10 cm cube, I mean maybe it is, we played with those 10x10x10 cm cubes in math class and they weren’t *that* big, maybe the stomach is two of those, but honestly if I misplace a factor of two here or there it really doesn’t matter too much, I’m doing far worse things to the numbers here, but you certainly shouldn’t be citing anything I’m saying to the sort of precision where a factor of two should matter, I’m being very open about how approximated this is. Human beings, on a similar note, are probably about a cubic meter or two tops, one or two million cubic centimeters, or in other words, about ten or twenty thousand eaten bananas of volume, and the stomach is probably ten or twenty. I know the human digestive system, miracle that it is, is capable of expanding somewhat to fit its contents, but the upper bound on that has to be somewhere less than the entire volume of the human body it is contained in. So if you’ve stuck with me on this exciting journey, I can now lead you directly to the point I’ve been slowly building towards, which is this: If you want to give yourself acute radiation sickness you are going to have to find a method other than eating bananas. You cannot fit enough bananas inside you at any one time to fatally poison yourself with radiation.
That you spent ten bucks to put this on my dash is a thing of beauty, bless the opportunities Blaze gives us.
(via garthgender)
