It is known that the banana contains small amounts of radioactive postassium, perhpas it would be possible to use a banana for scale? https://en.wikipedia.org/

It is known that the banana contains small amounts of radioactive postassium, perhpas it would be possible to use a banana for scale? https://en.wikipedia.org/wiki/Banana_equivalent_dose https://en.wikipedia.org/wiki/Banana_equivalent_dose