slab heat pipes and radon reduction
Unless you have had your house professionallly tested for radon and got a positive (i.e bad) result, do nothing.

If you do have high levels of radon, it's much simpler to install an exhaust fan system, either in the basement or (more properly) by cutting a hole in the basement floor and dropping a 6-inch pvc tube down into the dirt.  That acts as the source for a closed-system exhaust fan that should be ducted to the outside.