Background radiation of rock in basement

Ten minutes on a rock in my basement

This rock (pictured below) varied from 6-25cpm over a ten minute sample. This is a granite-like rock from the Salmon River in Idaho that has hundreds of garnets embedded in it.

Background radiation of rock in basement

Do you want to explore the world of radiation on your own?  It’s easy and affordable to own a Geiger Counter.  Learn more here: http://everythingisradioactive.com/geiger-counter/

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