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Yes best is probably to bust through the floor but as said above Radon is a gas and there is a reason they tell you to take the test with the basement windows closed. Open windows dissipates the gas.
My readings were on the edge 16 years ago when I bought but it was new construction so no settlement cracks in concrete. Since then I keep basement windows open as often as I can. I've retaken several times (closed windows) and still at or below. I've read it can vary naturally quite a bit in the same basement even over a short time
Any kind of air exchange under floor or not in the basement will lower your numbers. If you have well water coming in that could be another source
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