Another Dryer Vent Conundrum
You're there, and I'm not, but are you sure that the radon pipe goes through the joist? If I'm looking at the picture right, it looks to be like it goes vertical before reaching the joist. Regardless, if the radon pipe does go through the joist, I would typically jump over one bay, if for no other reason than for future maintenance. Doing so should be no problem with a pair of adjustable metal elbows. Use metal rigid pipe, metallic tape, not regular duct tape, and no screws; everything you need is available at your lcoal hardware or big box.