Varying Radon Levels

I used Aircheck and used 2 kits. First came back .7 in a basement bedroom and the second was an unfinished utility room at 17. Both closed conditions to the specs. Assuming the first was not tampered with, has anyone else had such a huge difference in readings between your two tests?

never had that much disparity, but they tell you not to check in a laundry room. I think it is because typically laundry rooms may have exchange due to venting that lowers the level, you got a perceived opposite result.