Be careful with the radon though, that stuff can be nasty. Rn-222 has a half-life of 3.8d, if it's in your lungs when it decays it stays there as it quickly decays to 22y lead via 3 alpha and 2 beta including Po-218 and Po-214. Even a tiny exposure can cause lung cancer and it accumulates. It also takes time for radon to be fully expelled, like helium.
Not saying it is guaranteed lethal, just that it shouldn't be treated lightly, same as any elevated exposure to ionising radiation.