Which Transportation Method Has The Least Radiation?

I brought my Radiacode RC110 Geiger counter on a trip, and compared which travel methods have the most and least radiation exposure! As expected, commercial air travel had the most, but it turns out if you fly lower in smaller planes you get *less* radiation exposure! You also get a lot less by taking boats, since the water blocks a lot of Earth-based radiation.

I should mention that I am not a scientist and this project should not be considered a rigorous experiment. Also, all the radiation amounts seen here are well below the limit for any known health effects.

Check out the Radiation Monitor I used here: https://radiacode.com/100-series
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