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From https://xkcd.com/radiation/

* Eating a banana: 0.1 µSv

* Background daily dose: 10 µSv

The calculation is probably more complicated, but as a back of the envelope estimation I expect that a banana increase the background radiation in a 1%: So it will be difficult to measure with a cheap equipment just counting the number of detections.

[If your device can measure the energy of the particles, perhaps you can see some peak?]

[If you log all the event for a day, with and without a banana, perhaps the 1% difference is statistically significant.]

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