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A banana contains naturally occurring radioactive material in the form of potassium-40.. Banana equivalent dose (BED) is an informal unit of measurement of ionizing radiation exposure, intended as a general educational example to compare a dose of radioactivity to the dose one is exposed to by eating one average-sized banana.
The banana equivalent dose, defined as the additional dose a person will absorb from eating one banana, expresses the severity of exposure to radiation, such as resulting from nuclear weapons or medical procedures, in terms that would make sense to most people.
The banana equivalent dose is sometimes used in science communication to visualize different levels of ionizing radiation. The collective radiation background dose for natural sources in Europe is about 500,000 man-Sieverts per year. The total dose from Chernobyl is estimated at 80,000 man-sieverts, or roughly 1/6 as much. [1]
Committed equivalent dose, H T (t) is the time integral of the equivalent dose rate in a particular tissue or organ that will be received by an individual following intake of radioactive material into the body by a Reference Person, where s is the integration time in years. [13]
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The banana equivalent dose of radiation was developed in 1995 as a simple teaching-tool to educate the public about the natural, small amount of K-40 radiation occurring in everyone and in common foods. [141] [112]
The sievert is a unit of both "effective dose" and "equivalent dose" (see for example the Glossary of ICRP 103). I don't know what is meant by "default Sv". In my experience, when sieverts are used it is almost always in the context of "effective dose" - for example in the recommended dose limits of ICRP - with "equivalent dose" generally only ...
It seems that there is a discrepancy of 100 times in the value of the dose received as a result of eating one banana, as quoted in this here article and as quoted in the article on Banana Equivalent Dose (BED). This here article states it is 0.0001 mSv, the article on Banana Equivalent Dose states it is 0.001 μSv.