Was not informed that cold joint of wall with slab needed to be sealed. I would have cleared perimeter of basement better.
The company whose test I used to measure the radon recommended you.
Warning: High radon levels have been discovered in every state and Canadian province. The information on this EPA Radon Map can be misleading to consumers. The US Surgeon General, National Radon Defense, Health Canada, and the EPA recommends every home test for radon.