Radon prevention

We did a Home Depot radon test and it came up as an avg of 5. I was wondering if using dry-loc on the concrete block walls might have enough effect to lower it down a point or so? They currently are unfinished blocks. I was also thinking if I stuffed some insulation or paper in to the top of the block sill and then did a spray foam sealer, wouldn't that cut down on possible infiltration?
Any thoughts?
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