ETA: I figured you'd be back and attempt to tell everyone off because we don't live in fear like you do. Chemicals and toxins are everywhere, even if you live in a glass house!! MODERATION!!!
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You know, you are going to find some type of chemical, gas etc in most everything. It's not like radon is seeping into your skin... If you tested your skin now you'd probably be shocked to see arsenic and maybe more.
Please don't live in fear like this and especially raise children to live in fear. Think moderation. To get enough radon, etc to harm you, you'd have to inject yourself with it daily.
Wood countertops just seem nasty to me.
We used Corian when we built in 2000. We love it, it's easy to clean and we are all still healthy!!!!
Check out new homes being built in your area. Granite used to be #1 but it is not as popular here anymore.
Good luck.