I would assume MJ does take it in. I have no clue what effect it may have however.

My parents have been living in a mountain house with radon issues. From what I've gathered. The gas is produced by the granite as it decays. Most solid forms of granite do not produce gas, but some do depending on the exact composition.

So, Last year there was a story I read, about how the demand for granite counter tops was leading a few companies to actually cut slabs from degrading rock. Results were that people actually were buying these personal radon factorys and installing them in their kitchens on purpose.:wtf:

They say if your house has radon, If you have a crawl space you need to vent the crawl space with high flow fans. Most houses pull the gas up through the basement/crawlspace and into your living space. Venting it outside before this happens is vital. I believe there are also cement sealers you can buy to reduce the effect. Cement IS porous and radon will flow right through it.