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Pedantry: It wasn't a geiger counter because it wasn't using a Geiger-Müller tube.

I don't think you'd see much of a difference even with a decent Geiger counter from a banana. The levels of radiation in food are tiny, and building equipment to measure it is not easy.

Probably if you found decent radiation source, or perhaps took it up in an airplane you'd see a difference.

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For what it's worth, I've used a (real) Geiger counter to examine not only a banana, but potassium supplement pills. I wasn't able to detect even the slightest increase over background radiation from either.

if you're a little crazy you can take the radioactive americium out of a smoke detector and use that as a source

And if you're a lot crazy you can build a fission reactor... our maybe that was a different source isotope?

If you're not that crazy, you can build a fusion reactor, although the design necessarily requires more energy than it puts out. Teens have built these for science fair projects.

https://en.wikipedia.org/wiki/Fusor

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