Robert, I am a SparkFun fan and also an actual Health Physicist. The XKCD chart is fairly accurate as far as it goes, but calculating (or rather, estimating) dose from a G-M tube rate can get complicated. I will make two offers to you. First, when you return, I will be happy to calibrate your instrument against an NIST-traceable Cs-137 gamma field to provide an (after the fact) true conversion from count rate to exposure rate. Second, if you are able to grab any soil samples I can have them analyzed in our laboratory. If you are interested but can’t grab my email from my user profile, reply here and I’ll send you an email directly.
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